^^ Out of interest I tried out medicgun_beam_blue_healing and targeted it on a func_button. I didn't get the full medic beam but did get a nice blue glow! My main computer is now bust though and I the laptop I'm using now crashes at the merest sniff of a particle system, so I couldn't investigate further.
I had a question for you though, how did you find out what the name of the healing ray particle system was? I'd love to know more particles systems that I could use. There's a wiki list, but it only shows 3 or 4 and they're all smoke effects.
(sorry to bring up an old thread, but I need to know!)