Hey all,
Just dropped a new vid that takes you through how to set up tab targeting-like macros both in GSE and in the basic WoW Macro Editor. This would include macros for any environment (PVE/PVP) and will cast your DoTs on fresh targets.
Yes, they work with all classes!
So give it a view (and perhaps a Thumbs Up + Subscribe as well)! 
Cheers,
–Ti Amo Gaming