This is one of those times when I'm sure I'm missing something, but I've thought it through as far as I can bring myself to, and... I don't see the benefit.

Like you, I use a "no focus leader" system and use focus for cc / specific-target healing. To set focus, I just use keybinds.

In my case, I have a G15 so I use esoteric keybinds but it's basically G1-G5 to focus each of my characters, and I can change focus mid-battle too - really important when I'm holding two sheep and want to actually kill one of them whilst re-sheeping the other.

Likewise for killing different targets (in PvE, one guy nukes the pet while the others nuke the NPC Warlock for example) - just different "/assist" keybinds.

This is how a simple pull usually pans out when I play my mage/mage/hunter/priest/pally team, where I hands-on play the pally:

- Select sheep1 target, hit G1 (first sheep target set), orange circle appears over his head, mage1 has it as his focus target.

- Select sheep2 target, hit G2 (second sheep target set), blue square appears over his head, mage2 has it as his focus target.

- Select kill target. Hit assist. All drones have my kill target as their target. Skull appears over his head for target confirmation.

- Pull with avenger's shield, hit generic "sheep focus" button shortly after I start casting. Hit it again if one got resisted.

- Tank, DPS, heal, re-sheep as needed.

- Target sheep1, hit G1 and G2 - both mages now have the same sheep target.

- Target sheep2, hit assist. All characters now have sheep2 as the kill target.

- Hit generic "sheep focus" button again. Sheep1 goes bah, sheep2 breaks, is mad and either runs to me (avenger's shield aggro) or goes for the mages. Either way I grab him on the way past.

- Repeat untill all mobs are dead.

There are variations for LoS pulls, pet off-tanking, shackling, etc, but they all rely on the same basic mechanism - dynamically shifting focus for CC and /assist for killing.

The only benefit I see of this proposed enhancement to Jamba is that I'll be able to manage targeting through slash commands instead of with keybinds. So long as I'm not in battle.

See? I just know I'm missing something here. What is it ? :S