Hi,

as far as I know it is possible.

To give a concrete macro for it, it is neccessary to know, what for you using you're focus and your target.
For example, your macro would use "focus" for the dps-target and "target" for the "leader", so if this is the case your macro should work.

I personaly prefer a modified "ftl-Aproach" (focusless,targetless,leaderless) from Pocalyps & Co. but this is pure personal choice.

One problem with the macro you described is, that i don't se a way, how you can set a sheep-target for your mages, cause focus is used for the dps-target and target for teh leader...

but it could also be, that i'm not clearly understand what you mean by the latest trend of "focus-based-targeting"...