I have taken the liberty of doing some organization.
I have created a full blown Github repo here. The master branch is the latest from benjol's gist and all commit history is included. The master branch can be installed from this alternate location as a userscript using this url. This should make it easier for others to fork and send pull requests with changes back upstream.
I have created branches that include all the gists that had been forked off of this and merged in those commits. Most of these are behind master and would need rebasing, but at least no work will be lost in the shuffle and this should make it easier to review and integrate their work.
I have created a fork of my own and selectively merged in changes from the branch that came from Izzy's work in gist. His work includes changes so that custom comments are stored and retrieved per-site, but it also included his default comments hard coded in. I cherry-picked just the functional stuff and made a few tweaks. I have tentatively called this 1.4.0-beta1 and can be installed as a userscript from this link. There are some known bugs still but when it's ready I'll submit a pull request and maybe these can be merged into master.
This was just leg work to get everything cleaned up and manageable using a full repo instead of gists which were gitting out of hand.