Ok to the OP, as far as i can tell, your tri-boxing?
You have 2 low lvl toons and then a main paladin boosting them through sm right?

In that case, you can bing your mains movement keys (the paladin) to WSDAQE etc, then your 2 alts to <- -> and up and down arrows, or shift AWSDQE or numpad keys depending if you ar right or left handed, etc. then spells for your main 1234567 and then alts shift+1234567 / f1 f2 f3 f4 f5 etc etc etc

P.S I suggest you look at this: Beginners Guide 2 Dual-Boxing (3,4,5 boxing) <-- I used that to get me started on dual-boxing and it worked first time.
Might also help if the otherone doesnt : [Keyclone] setting up a command to work with maximizer (step-by-step)