I can answer one of these, yes you can add more functionality, you use the 
existing gestures but with a modifier key pressed (such as control, or whatever 
you wish) and then you assign an action to a gesture.  This is all done within 
the Voice Over utility under commanders, trackpad.  No scripting involved what 
so ever.

Chris 
On 30 Jul 2010, at 14:58, Mary Otten wrote:

> Hello all,
> In anticipation of the arrival of my magic track pad some time next  week, I 
> had a look at the article on the Apple website that gives a list of voice 
> over gestures in snow leopard. I didn't exactly understand what one of them 
> does, or at least, when you'd use it. It is the one to force voice over into 
> a straight line by dragging a finger horizontally or vertically , I think 
> while holding down one of the keyboard keys, control? What does this actually 
> do? I wondered also if it is possible to get an actual mouse click on the 
> track pad while using voice over. Do you have to turn vo gestures off and 
> then double tap? And, last one, I thought I remembered somebody on this list 
> talking about their ability to add more gestures than what has been 
> programmed into the track pad commander and mentioned in that Apple list. 
> Maybe that was using apple scripts, beyond my abilities at this point. 
> Clarification would be great.
> 
> mary
> Mary Otten
> [email protected]
> 
> 
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