I'm using a custom Touchégg multitouch gesture setup in Ubuntu 11.04 with a Magic Trackpad. Since the default gestures (such as 3-finger tap and drag to move windows, 4 finger tap to reveal the dash, etc.) are apparently hardcoded in Unity, I'm unable to assign any custom Touchégg actions to them, and some default gestures (that I don't intend to use much, if at all) occasionally mix up with my similar custom-assigned ones and get triggered by accident.
Is there a practical way (short of tweaking the uTouch source) to disable some of the default gestures? If not, pointers to parts of the code (perhaps in grail?) where the default gestures are defined, and help with tweaking would also be appreciated.