[xmonad] xkb, xmonad and mouse accessibility

[Maurí­cio]

Hi,

I like to use the keyboard to control the mouse, using a feature I was 
told belongs to a module of X ('xkb', I think). I press 
Alt-Shift-NumLock and then the keypad controls the mouse.

After some time using that inside xmonad, it stops working, and I have 
to activate it again. Do you think that can be caused by xmonad? Or I 
should search only for X information?

Thanks,
Maurício