[bsoriano]

I seriously doubt MPC-BE won't let you change a key.  I don't think you went about changing the key in MPC correctly.  You should be selecting 'clear'.  After that you click the little box to the right.  Then type exactly what key(s) you want, in this case, press ALT + 4 and it fills in.  Then save.  I think there is only one MCE Keyboard.

Thanks! I will try tonight when I get home.

Regards,

Bart