I and others have suggested similar before, but I would change the numbers considerably. Healing at 90-100 and damage boost at 35% for the single target beam. I guess I could live with a shorter beam length, but I still think it should be somewhat longer than the regular.
While you’re at it, increase the rez-range in Valkyrie, momentum easily carries you out when rezzing as it is now. Possibly toy with the idea of a rez-reset.
Also, instead of pressing Q you can just use her empty reload key to toggle the beams.