There has been a number of times when for one reason or another a healer or a tank was unable to finish a run and it leaves the rest in a bind. So often i would love to be able to switch from dps to healer since DPS is much easier to replace and then we can just finish out our run. Same goes for people who have tank alts. But we cant. We are trapped in those rolls until its done and classes like healers or tanks which are harder to find at times become our purgatory as we wait for one to show up.

There is much that all MMO's can learn from each other and one very useful ability is the ability to change your class before filling in that empty slot. Some active it with the ability to leave the dungeon, without dropping participation, to switch class and then reenter. That is also another useful ability to leave the dungeon to say make room in ones bags and come back. Or we can just be allowed, while not in combat, to switch our role from say from DPS to healer, so long as there is not already a healer registered at that time, so that we can continue our dungeon run without too much disruption.

This is a change that would help out alot and i think SE should seriously consider it.