I have abilities (action bar slots) macro'd to the 0 and 9 keys on the numpad, so it's definitely possible. Make sure you don't have numlock off or something when you're trying to set/use the hotkeys though.
I use NumPad 0 for my distribute shields bind and it seems to work fine. I actually had to turn OFF Num Lock in order to set it via the Game Menu -> Options -> Key Bind menu. For some reason it won't let me set a NumPad with Num Lock.
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But still Numpad 9 and Numpad 0 wont work...
Can you post your binding in a txt file... (explained somewhere in this forum, cant find it right now..)
;-)