There are a lot of feature-request's on [Meta](http://meta.stackexchange.com) that seem useful. I've gone through some of them, and made one userscript to add some, or all of them:
Features added (go to Github to see their descriptions):
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- [Fixed Topbar](http://meta.stackexchange.com/questions/101385/should-the-top-navigation-be-frozen-optional) (v0.1)
- [Unfade low score answers](http://meta.stackexchange.com/questions/129593/un-fade-low-score-answers-on-rollover-or-click) (v0.1)
- [Move `show more comments` link to top](http://meta.stackexchange.com/questions/55020/add-a-show-more-comments-button-to-the-top-of-a-list-of-comments) (v0.1)
- [Ellipsis after long names](http://meta.stackexchange.com/questions/244729/provide-an-ellipsis-after-a-long-name-instead-of-truncating-it) (v0.1)
- [Rename chat tabs](http://meta.stackexchange.com/questions/246289/change-the-browser-tab-title-on-chat-pages-to-chat-sitename-or-chat-room-name) (v0.1)
- [Move `start a bounty` to after the question (instead of after comments)](http://meta.stackexchange.com/questions/234095/can-we-move-start-a-bounty-to-a-more-intuitive-location) (v0.1)
- [Make the bounty box draggable](http://meta.stackexchange.com/questions/170125/make-bounty-custom-message-dialog-box-draggable) (v0.1)
- [Fade out vote signs on deleted answers](http://meta.stackexchange.com/a/174806/260841) (v0.1)
- [Replace > bullet points with more normal ones](http://meta.stackexchange.com/questions/195779/can-we-get-rid-of-the-disclosure-triangles-that-dont-disclose-anything-on-the-e) (v0.1)
- [Differentiate between employees<sup>1</sup>](http://meta.stackexchange.com/questions/246678/should-se-staff-have-a-special-character-in-their-user-name) (v0.1)
- [Remove exclamation mark on error](http://meta.stackexchange.com/questions/244375/you-can-only-undo-a-comment-vote-within-the-first-60-seconds) (v0.1)
- [Highlight only the tags for your 'favourite questions'](http://meta.stackexchange.com/questions/238591/should-favorite-tag-highlighting-in-question-lists-be-changed) (v0.3)
- [Show your username in the topbar](http://meta.stackexchange.com/questions/209992/my-username-instead-of-my-gravatar-in-the-top-bar) (v0.3)
- [Colour the answerer's names in comments](http://meta.stackexchange.com/questions/19574/highlight-comments-from-answer-author-in-addition-to-question-author) (v0.4)
- [Add KBD and Bullet options in editor toolbar](http://meta.stackexchange.com/questions/102841/key-equivalent-for-kbd-kbd) (v0.4) - <kbd>alt </kbd>+ <kbd>k</kbd> / <kbd>alt </kbd>+ <kbd>l</kbd>
- [Add pre-defined edit reason checkboxes on edit pages](http://meta.stackexchange.com/questions/190461/improve-the-editing-flow-with-predefined-options-for-edit-summary) (v0.4)
- [Change the 'share' link to show link as markdown format](http://meta.stackexchange.com/questions/126544/add-a-second-share-button-to-posts-with-comment-ready-links) (v0.5)
- [Add <kbd>Ctrl</kbd>+<kbd>i</kbd>,<kbd>b</kbd>,<kbd>k</kbd> support to comment fields](http://meta.stackexchange.com/questions/14756/formatting-keyboard-shortcuts-for-comments) (v0.5)
- [Add a button to reveal spoilers in a post](http://meta.stackexchange.com/questions/249808/add-a-way-to-reveal-all-spoiler-blocks-in-a-post-at-once) (v0.5)
- [Highlight on hold/closed questions](http://meta.stackexchange.com/questions/250428/should-the-questions-put-on-hold-be-marked-on-questions-list-with-a-color) (v0.7)
- Add shortcuts for adding pre-defined comments (v0.7)
- [Differentiate between empty blockquotes and spoilers](http://meta.stackexchange.com/questions/104085/differentiate-spoilers-from-empty-block-quotes) (v0.7)
- [Add reply links for quick replying](http://meta.stackexchange.com/questions/74778/add-reply-link-to-comment-that-pre-populates-comment-box-with-username) (v0.8)
- [Parse cross-site links to questions](http://meta.stackexchange.com/questions/251183/parse-question-links-from-other-se-sites) (v0.8)
- [Show answer counts on sidebar](http://meta.stackexchange.com/questions/251771/show-number-of-answers-as-tooltip-in-the-sidebar-questions) (v0.9)
- [Button to add author's name to hyperlinks](http://meta.stackexchange.com/questions/251722/is-there-a-way-to-automatically-mention-the-author-of-an-answer) (v0.9)
- [Confirm when navigating away if you have started writing a comment](http://meta.stackexchange.com/questions/252205/add-are-you-sure-you-want-to-navigate-away-from-this-page-when-writing-a-comm) (v1.0)
- [Allow you to sort bounties by their amout](http://meta.stackexchange.com/questions/7753/please-give-us-the-ability-to-sort-featured-tab-by-bounty-amount) (v1.0)
- [Add a label when the question you are viewing is a 'hot-network question'](http://meta.stackexchange.com/questions/245390/let-mods-and-10k-know-when-questions-go-hot) (v1.1)
In this script, I've made everything optional. You choose what you want - if you hate the fixed topbar (which it seems a lot of you do...), disable it!. The options are saved via GM_setValue<sup>2</sup>.
---
The script
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***It's on Github [over here](https://github.com/shu8/SE_OptionalFeatures).***
Please post any feature requests (along with their meta link, if applicable) and bug reports (along with any errors in console, if applicable)!
I've only tested it on Google Chrome - please tell me if you find any compatibility issues. You need to have something like [Greasemonkey](http://www.greasespot.net/) or [Tampermonkey](http://tampermonkey.net/) or [Scriptish](http://scriptish.org/) to be able to use the script because it relies on `GM_*` functions.
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<sup>1</sup>This is a flawed idea right now, it might call a normal user an employee (hence the tooltip '*possible* employee'), but basically, there's a list of names in an array and the script checks for names and sees if the name is in the array. If it is, a star (★) is added after their name:
![no need for context ;p][1]
<sup>2</sup>You will be asked to set the options if you browse on an [SE site](http://stackapps.com/a/4791/26088) without them already being set. If you want to change the options, a link is displayed (`add features`) on your profile. Clicking it will show a box for you to choose the options you want and save them.
![enter image description here][2]
---
Change Log:
--
- 15/01/15 - v0.2: Switched from cookies to GM setValue (thanks for idea @BrockAdams)
- 16/01/15 - v0.3: Added more features (mentioned above)
- 25/01/15 - v0.4: Added more features (mentioned above)
- 22/02/15 - v0.5: Added more features (mentioned above), minor bug fix
- 28/02/15 - v0.6: Bug fixes (thanks @IlmariKaronen):
- Works on Firefox now
- `unspoil` feature updated
- Popup now shows in centre of screen
- Show descriptions after checkbox
- Update checkbox values to saved settings when you open the dialog box
- No more auto-delete settings after you open the dialog box
- No annoying alert when you don't choose any options / save the options
- Renamed save button
- Compatibility with new (currently MSE-only) profiles
- 06/03/15 - v0.7: Added more features (mentioned above)
- 22/03/15 - v0.8: Added more features (mentioned above)
- 26/03/15 - v0.9: Added more features (mentioned above), updated `kbdAndBullets` function to make icons fit better
- 29/03/15 - v1.0: Added more features (mentioned above)
- 30/03/15 - v1.1: Added more features (mentioned above)
[1]: https://i.sstatic.net/Rxg5V.png
[2]: https://i.sstatic.net/nlcwi.png