Take this example:
http://api.stackoverflow.com/0.9/questions/3165492;3182016/timeline
Would it not make sense to have the question_id as a parameter on each timeline object? It makes the timeline api pretty useless if you pass more than one question id does it not?
I would like to build a monitoring system for questions and batching up requests to the timeline api seemed the most sensible way to achieve this.
/questions/{id}/timeline
has gotten that this oversight wasn't spotted until the day before 1.0 release.... But its a pretty major one. [status-planned], will happen today.