I can confirm this issue on a C1D MBP 17" 2.16 10.4.8
Issue for me: Activate something disk intensive (random) and cursor is frozen for 2-5 seconds. I just discovered that the center of the pad seems to release it. OW, I sit and wait, finger going in circles 😟
If
ignore accidental trackpad input is checked, the issue occurs. If it is unchecked, it does not. BUT, with
ignore accidental trackpad input unchecked, it is a nightmare typing with the wide trackpad sitting there waiting to screw things up.
Thus, IMHO, this is a driver issue. Esp. since activating the center of the pad seems to release the cursor.
MBP 17, G4 400 & PB G4 400 Mac OS X (10.4.8)