Shoutbox

I've found quite a few keymappers out there, but I can't find one that will allow me to do what I want.  I recently bought a USB numpad, and I want to map the keys, to where it won't effect my regular keyboards numpad.  I also want to be able to map keys to do multiple keystrokes.  Like, I want it's plus and minus keys to do CTRL+ALT+UP and CTRL+ALT+DOWN respectivly, and other stuff like that.  Is this possible?