Here we go again!
I voted for better monetisation options because I'm sure C2 is already fit for making a commercial web game.
If I could pick another 2 options, it would be:
1- Multiplayer (simply because I'm working on a 2 player idea :P)
2- Image Editors: a "fill with color" would do for fast prototyping! I'd love to see support for coordinate input on origins, action points and collision vertex. Oh, and also a preference option where I could set the default for "use bounding box" vs. "calculate collision" when importing images.
Indeed, a container (or parent object) would be great!
Even sweeter if we could define which properties should be inherited (position, scale, rotation, opacity)