You can do the equivalent when you're soloing. Pull the entire group and kite them away from their starting location, then Riddle the mob that you intend to burn. HiPS, and all of the mobs except the Riddled one will return to their original position. Burn the target away from the group, and then go finish the rest.

In a group instance where mobs don't respawn, your suggestion is a bit OP. It lets your multi-person group fight a multi-mob one at a time.

I do miss the old Enrage skill that caused ranged mobs to run in and fight you melee. You could make them fight you behind a tent where wanderers weren't going to join in unexpectedly.