Pinotnoir, the simplest way for you to modify your macros is through

Code:
/cast [target=target, nodead, harm][target=focustarget, nodead, harm] spell
and maybe have a macro that just sets focustarget to your target

Code:
/target [target=focustarget, nomodifier]
/cleartarget [modifier]
if you need to tab target, just hit this macro first, it will assign your tanks target to your followers as their target allowing you to change target willy-nilly hitting the macro again with a modifier will clear their target, resuming normal operation