In large seeked captains getting a marker can be quite annoying, even more annoying on Dungeons and PvP. Now that we have 12 souls (8 more than previously) equipping souls have become a trick task as we need to scroll through the list of souls and selecting one. By the time one is done, the marker will likely be unavailable.
So I would like to suggest adding a quick soul equipping feature. What I was thinking was holding a unit on the unit bar and clicking a single keyboard key (which we would eventually memorize) to equip the soul set to that key if the soul is available.
I'm sure the devs could figure something more practical, but I wanted to put the idea out.