Also: F1 through F6. Much quicker than the clicky-thingie, particularly if your left hand is already on aswd. Arranging your group window vertically will make it easier to see who is who.
I typically have a 'nearest target' set up too, near my awsd, but that can be a pain when outdoors --- why's the tank wailing on that poor resource node? Stop it already!
A 'nearest hostile' would be nice. I probably just haven't found that yet.