Tried it last night. Ran pretty badly on my computer (even with optimisation) and I just got pretty confused. Think I'll wait for beta or open release.
I think medics should be able to enter Red Zone if they choose to, but are required to wear a certain uniform that has a carrier rig and helmet. Potentially bright blue, so players know they're medics and are making the conscious choice to kill them.
We don't "really" need medics. Medics are there to promote RP - if a user's RP isn't up to scratch, they shouldn't be a medic. They're also there as a user convenience so people don't lose gear. It's entirely up to them if they want to wait for a medic to get to them to assist them.