Since Families are done, I thought I could sneak in a few very simple suggestions to improve the usability of C2.
1. Boolean instance variable default default value (heh) should probably be 'False' instead of true. It just seems that most boolean instance variables need to have 'False' as default (Community, let me know if it's just me).
2. Default image resizing option should probably be stretch instead of 'align top left'. In my opinion, stretch is more multi-purpose, and forgetting to change to stretch one time causes me to have to re-load the image as there is no undo in the image editor.
3. I'm not sure if this is even feasible, but the new feature that allows rotating/resizing of multiple sprites at once is practically useless (moving them is fine however). This would be much, much more useful if the sprites all rotated/resized around a common point instead of their respective origins. I am sure that everyone would agree.
4. Whenever I turn 'snap to grid' on or off, the ribbon hides itself. I suppose this happens for every button, but I would much rather the ribbon only hide when I click something in the event sheet/layout editor.
Just my 2c, most of these are easy to implement ;)