resizing the virtual MIDI keyboard

[Bric]

I am running denemo with a touch-screen monitor right now.

It occurs to me that it would be totally awesome to make the virtual MIDI 
keyboard resizeable such that the keys actually expand to greater pixel 
dimensions, to one's liking

With touch-screen you can actually use your fingers to tap the screen and play 
(!). Except right now it does not re-scale (only lets me resize the window 
horizontally, and with that it simply fills the greater width of the window 
with *more* keys, rather than expand the keys' size), and my finger tips are 
too big for the keys drawn on my screen.  If i resized the keys by just 30%, 
say, it would be an awesome way to input data.