reactor and om status are definite pluses. spawn status is also a good thing, but maybe irrelevant during some parts of the game. it would be nice if it was a thing you could toggle on and off.
not so sure it would be good to have a om/reactor direction indicator. for aliens, this is somewhat unnecessary in many circumstances, because the overmind isn't necessarily your base location. makes more sense for humans.
the best thing, however, would be a signal that pulses whenever a structure takes damage, and indicates the direction. like a pulsing arrow in the radar section.