With the recent removal of Shadow Flare, this really only applies to Shukuchi and caster Limit Break (and probably some quest items), but I feel that an indicator around the player that denotes the maximum range of ground targeting abilities would be very beneficial.
Something as simple as a ring on the ground would help someone quickly determine the furthest point you can cast an ability without having to mouse around to find it.
If this is already a feature and I'm just too dumb to find it, my bad haha