A few comments after playing the beta and reading here:
The menu at the bottom does cause interference i.e. I tap the cue and stroke back and the screen sometimes jumps to move mode because I have dragged over the move icon. Moving this menu to the side may be a good idea.
The background colour - I personally prefer to play with the backgrounds off - it was the same with VP3, but quite like the black. I guess this is a personal thing so would it be possible to have a choice of background colours?
The sound settings - if I play with my device muted, the sound still plays for the movies even with the in game sound level at 0. I can hear the speaker's slight hiss which means sound is enabled and when I quit the game, the device is now un-muted albeit with sound volume at 0. Is it possible to have an in game setting of No Sound which will keep the speaker turned off?
The cue - it looks a bit blocky compared to the gorgeously rendered balls. Is it possible to have some degree of anti-aliasing on the cue?
Mapping of hardware buttons? I agree with the comment of the Aim and Overhead buttons not being in a good place but the option of mapping buttons would be good for this and also the whole up and down joy pad argument in landscape mode.
Portrait vs Landscape orientation. I'll always trust the developers judgement on this one and like the landscape view but if you have toyed with the portrait view - would it be possible to have the choice of either view in the game?
Cueing action. The stylus works great for stroking the cue but I did find it hard to have a medium power shot, it seems like a fine line between a soft or a very hard shot although perhaps I just need more practice with the beta? Anyway - perhaps toning down the power a bit on the standard shot and introducing the Amplify feature from the Desktop versions may help around this issue.
That's all for now but I am very impressed with this title - it is silky smooth to play and will no doubt be my most played game on Pocket PC now I can take it with me. I have clocked up a lot of hours with VP1/2/3.