>"Is there any way *not* to move the mouse cursor while getting the Magic Trackpad’s data with fingrpinger in Max?"
You can use the [aka.mouse] object to put off the mouse. Attached here is a patch to automate the mouse off-on when putting fingerpinger on-off. It works for me with my MBP Trackpad.
( I also put an option to disable the 4-fingers exposé and application selector problem, but it still have some issues, plus it looks like if i update to 10.6.4, this can be turned off, see discussion here : http://www.anyma.ch/blogs/research/2010/08/10/fingerpinger-works-with-the-magic-trackpad/ )