There isn’t really much to say beside the title.
Especially with the change from the talents, head poppin’ non-special/non-elite is meaningless even more than before.
With assail that basically auto-target, running a Brain Burst build is even more frustrating as you just have to pixel-hunt the target while your “brethren” just spam shards and run yelling “LOL”.
I don’t suggest having the ability not target normal units at all, but at least having a mode that target just the specials/elites/boss. A decent suggestion (balance wise) may be that when charging with the right-button, it automatically targets only those units. It costs more already, but it allows being more precise, ignoring the lesser enemies.
Alternatively, BB left click targeting could simply get a “tag-able enemy” priority.
Afaik, BB basically projects a narrow cylinder or cone from your body, towards the point that you aim at.
When an enemy collides with the cylinder/cone, it gets locked (in case of multiple enemies being found, probably with some form of additional prioritization, the closer the target is to the player or to the center of the reticle).
The ability could check for “any target” and “priority target”.
If no target is found, check again.
If one or multiple priority targets are detected, BB would simply apply the current targeting logic to the viable priority targets (and ignore the regular enemies).
If no priority target is found, BB would apply the targeting logic to regular enemies.
Right click can already be used to try and pick a specific target to pop, so it could stay as it is and still do that.