keyboard commands MD11 on FSX

hello. 1- in overhead pannel there are 2 buttons, APU PWR and APU, i like to give them a key command. is this possible.2- i like to give the baroset (altimeter) QNH increase and decrease a key command. the box for the mouse cursor is verry smal in VC cockpit and moves while flying. i know there is a reset button, but i like a key command.3- i like to assign key commands in the NUM PAD, they are not working. while everywere else they do work. my num pad is switched on.ramon kamstra.