Thinking today not about the impossible to do, but the hard to do.
It would be nice for the editor, especially the backdrop editor to have a setting for 4/3 16/9 16/10 etc. and portrait/landscape.
It would be nice to be able to hold the mouse buttons to adjust the table angle, POV, layback, etc. and maybe shift key and mouse (throw in cursor keys too) for offsets. With visual feedback. Maybe spikes that would show the result of layback. This is a great deal of trial and error for me as it is now.
The plunger needs as high of resolution as you could give it. Count the pixels of an average plunger on the screen. 256? 230 of motion? The plunger needs to be ideal for it to become a standard.
Rubber bands. It's time for VP to get rubbers. A few nice beveled posts thrown in just because.
Isdropped = true and false as the start of a motion, not an end result. As an option of course, with a user defined time, if they don't like your default.
That's my two cents for now, but I have a couple of bucks if you want more.