All cool ideas, except the current map location button, navigating the core is supposed to be hard at times, especially in new areas, getting lost is part of the fun.
I particularly like the medic UI indicators over injured friends, mitigated by skill, that would be really nice to see. Maybe a red cross hovering over people below a certain percentage of health for first aid, and then a skull symbol that appears over the top of the cross if they fall into negative health for doctors, that way someone who has both wont get a clutter of hovering symbols, just 1 over each player that "updates" when they fall into negatives. (the skull could turn red if they die but are not under the effect of a defib timer, if they are, the symbols disappear and reappear if the timer is just running out etc).