There is a little plugin for AMX Mod X called amx_heal and thought that I could try and write something better, or at least something like the DoD:S Realism Mod Medic feature...
So I wrote a plugin for TV2 called dod_medic

Players can heal themselves by doing a "say /medic". Bind a key such as:
bind "k" "say /medic"
You can only be healed if your hp goes below 20.
It will only heal you to a maximum of 60hp.
The screen fades to black while you are being healed.
Still to do: add sound while you're being bandaged and the "Medic!" shout...
Enjoy!