I have my key polling at 50ms, and 'use scrolling acceleration' at 20. The only issue I've had with this is the button used for game info....but it's also the button I use for the cabvol app.
What happens is that, in MaLa, if I press the button all the way down, the game info will appear and disappear.
In or out of MaLa, if I hold the button down, cabvol will not enable lowering or raising of volume.
In both cases, if I press the button just beyond the microswitch click, the issue is rectified. So I think it's the button.