Limit breaks should all do the same damage

[Torunya]

Except those lucky DF parties that do not have a melee DPS to use the "Real LB".

I support the OPs request.
In fact, set it up much like Ricochet works on a MCH;
Deals 100 potency to primary target, then 300 potency split between all nearby targets.
If only one target is within the radius of the effect, the full 400 potency is dealt to the one target.

Therefore, Ranged LBs are as strong as Melee LBs but ONLY when striking a single target.

All of my yes.