Imagine Powder Toy with the Elements of Dan Ball? That would Be AWESOME, (And no-one Say it would be a rip off because if anyone cared about that then Powder toy would have been Banned or Deleted Long ago), like the lazer, The fighters, the fact you can have a two player stickmen, lots of fighters, and many more, lolling at Box and Ball , Who agrees?
3) em i think will be more useful an option menu...with some submenus (like view mode, physics options*, display options**,etc)
*physics options: options to activate o de-activate the physics in for example powders or something like that, or the option to make some solids with gravity or physics
**display options: options to select if you want to expand the work area to Scale:2, or to resize the area of the program