I recently dared to make the jump to Vista (64bit) SP1, but what about:

1) Altering the mouse USB polling
Who knows a solid working program to change the default 125hz USB polling to 250hz or 500hz? This tweak is very welcome for mice like the Microsoft intellieye ones (WMO, IMO, IME). I used usbhidf under XP32 before, which only adjusted the polling for HID devices, so it wouldnt affect a scanner/printer or other USB connections.

2) Mouse accel
Does this OS still give mouse accel even if you disable "enhanced pointer precision"? For windows XP it did, and we had all these tricks like a reg fix or anirs accelfix which altered a system file. Is this still needed (for these older games)?

3) Windows mouse sensitivity scaler
Does this OS still give bad scaling when choosing a different setting than default (6th notch - 1:1 mapping) at the mouse sensitivity bar? Or is this the fault of DirectX' (directinput filter?)?

4) Any other gaming specific tweaks for this OS?

I know there were previous threads about this, but there was still quite some confusion. And my question is specifically about the 64bit version (since this is the future - utilizing more RAM).