yeah the way I run my two mages is to have a macro on each to assist leader, set focus and I just hit that for each in turn as my leader has cc mob targeted

Once combat starts that I use their standard assist leader macro for nuking down target, and if I need to reapply cc during the fight I just use a macro to target focus, poly, assist leader again

so if we have /assist party1, /focus as macro 1, on mage 1 it would be G1 and on mage 2 it would be G2
/assist party1 as macro 2 would be 1 key for both mages
/target focus, /cast polymorph, /assist party1 as macro 3 would be G4 for mage 1 and G5 for mage 2

Before fight leader targets first cc, press G1, target second cc, press G2, target first kill mob, press 1, pull...if fight goes too long press G4 and G5 as needed and then 1 again