Difficulty of use on phones without many buttons

[Rama Lightfoot]

I have a G2X which only has 3 buttons (power button, and volume up and
down). Other than that it has touch sensors for menu, home, back, and
search. Full functionality is particularly difficult in most modes as
either, a) it's easy to SEE everything but you can't really control
the PC, or b) you can control decently well, but not see the PC
effectively on the screen.

I think a good work around, at least for the default input mode would
be to put a mostly see-through button in one corner (that could easily
be slid to different corners by simply touching and sliding in the
direction of the corner you want to move it to). This button switches
between screen pan mode to touch input mode.

Additionally - as most phones support multi-touch (method would still
work in zoomable mode as you'd only be doing this while in mouse
control mode - toggled through the transparent button), could it be
possible to implement a second touch of the screen as right mouse
click? the double mouse click for right mouse click, and long hold for
left mouse double click is.... disorienting and difficult to get used
to. Or use a method similar to Wyse Pocket Cloud, with a control wheel
that you touch to move the mouse around on the screen, then touch the
different buttons to send different presses to the screen.

I'm still trying to think of a good method for sending a scroll wheel
to the PC. Perhaps simply two fingers on the screen moving up, down,
left or right, to signify scrolling in those directions?