Healthbars will not, and cannot be added without engine changes. Badspot took them out so I doubt he would put them back in.
Any public mod that requires both the server and clients to have the mod generally doesn't work out too well.Many players in the server wont have the mod, but the players who do have it may be in servers that don't have it.
Couldn't you make a health bar with some sort of GUI? Same with a sniper scope.
a compass mod have been already made
1. You get used to not having health2. You put health twice
Use the GUI editor to add an energy bar, and have the energy bar set to measure health.Done.
Getting player health on the client side will return -1 no matter what you try. This will make the health bar always look full (damage is 0 or less).