Alohas as promised by the title, n-boxers!

I'm Brian and I used to 3-box in Lineage 2 - it was the most fun I've ever had in a video game, even on one of the most boring games. So by my incredibly complicated calculations, boxing in WoW would (in scientific terms) own! I've had quite a look around the forums and I love what I've seen. There are some amazing setups here.

Right now I'm trying to figure out the plan I'll take for a 5box PVE group - and my question is this: Is there any way that I could get characters to target based on raid icon? For example: if I have a prot warrior, fire mage, arcane mage, shadow priest, and holy paladin, I would love to be able to throw raid marks on two mobs and hit a button which would fire macros on the mages, making them target the mark to which they are assigned and Polymorph.

I did a bit of googling on the subject, and it seems that it was possible at some point pre-TBC, but has since been removed from the API.

Are there are any workarounds you've used/encountered? If not, how do you handle CC without a lot of manually using each boxed character?

Thanks in advance! =)