set_mouse_acceleration
status_t set_mouse_acceleration(const char* mouse_name, int32 speed);
if (set_mouse_acceleration(fTouchPad->Name(), value) == B_OK) {
set_mouse_acceleration(fTouchPad->Name(), fSettings.trackpad_acceleration);
set_mouse_acceleration(fTouchPad->Name(), fSettings.trackpad_acceleration);
if (set_mouse_acceleration(fName, factor) == B_OK)