Search for the "No Focus Manifesto" on these forums, if you're interested in a Target=TargetTarget assist method.

The weakness is a fixed order of assist.
As in, if Toon A is active, everyone assists Toon A.
But if Toon A is not active, the assist automatically goes to Toon B.
If you don't mind that, its a decent method.
I used this approach, prior to coverting to FTL via IS Boxer.

Your Focus is free, for PvE or PvP.