i'm gonna be adding to this post a lot. Hopefully someone from Apple will read it and take note.
1. Editable Guides in the Canvas for compositing, and while your at it, give me guides like I have in Keynote and Motion that do all that snaping and centerlines and baselines.
2. Let me grab more than one keyframe at a time in the Viewer.
3. Real honest to goodness background rendering of the timeline that i'm working on. Maybe I can set a region of where I want to work and it won't mess with that section but everything else is fare game, Render Away!