Im still not hearing much else about something Construct cant already do.
Other than the "painting" feature lets have some feasible suggestions.
Like the ability to change frames via a context menu when the object is right clicked.
Also a hint for something that's not on the keyboard shortcuts list:
If you have multiple objects selected, you can deselect one by one by pressing the shift key and clicking the object you want deselected.
scidave
You should probably preprocess the images in an image editor, Gimp, or Ps.
But in all honesty making up your own is the best bet.