#1:
As long as a player remains in the healing station range the damage taken by the player is transmitted to healing station. (Why? I have no idea, maybe it overload because of sudden bursts of healing needed to be done or something.) Drop healing station’s HP to around 50-60 (i think it’s at 75 right now) and effectively people camping in the HS can take only so much damage before HS self destructs.
This invalidates tactics based of placing HS behind a corner and peaking for a moment to shoot since HS would get destroyed fast. Obviously HS HP would be ‘shared’ among all the people in the HS range (example: you have 3 players in the HS range, HS has 50HP, one player takes 10 dmg, other two 20dmg each - HS self destructs).
#2:
Healing rate is shared among all the players within range. Simple and effective. Makes team camping around HS impossible. Healing would be too slow.