I do agree with posting on the forum, but I think having a wall of text with many suggestions isn't the best idea. I forget how the suggestions platform works, but I don't think I could even leave a vote on all suggestions posted here!
I think things like "on collision exit" could be excluded, as these can be done with events already.
2D camera seems like a huge idea for not much outcome, like merging existing things into a plugin sounds like a recipe for disaster.
Merge same behaviour if 2 behaviours exist - It's a good QoL idea, but again worked around by naming your behaviours (e.g. If you had sprite that's in family, and has 2 tween behaviours, call one Tween_Sprtie and the other behaviour Tween_Family).
I do agree with some things that cannot be overcome or help with huge projects, like cancelling a build, track undo redo, organisational tabs. I'll login and vote soon!
I plan to do a forum post on some things I would love to see in the event sheet view, things that slow me down when working on a huge project which I cannot find workarounds for (maybe others might offer workarounds I never thought of when I post).