you can also activate AA abilities from the chatbox using:
/alt activate ###
where ### is the number of the ability. I have a whole list here...impossible to list them all, but a few are:
35 for MGB, 43 for Exodus, 47 for Cannibalization, 58 for mend companion, 109 for Rampage, 110 for Area Taunt, 117 for Strong Root, 153 for Radiant Cure..
the list goes on. if you want the number for a specific AA ability just post the name of the ability and I will post the number for it if its on my list.