As the topic says. Is that possible? to run a server were demo users only have demo cars and those whit license can have s2 cars?

In my case. I have a server that me and my friends are driving and its only me that got license and I want to show the sauber, but is a demo server so I have to sign in as a demo user and then i cant show the sauber. (want to inspire so they want to by S2 license. :P

Is it possible?

nope, fraid not, although a TBO bash around BL1 would be fun!

It's not possible to combine Demo and S2 server content, I'm afraid.

If your friend lives nearby, invite them over to see your rig, or if not then there are some pretty impressive LFS videos to watch online. Have a look on Google and youtube, and send across some links

Doh... that sucked :P
is it possible to make that feature in the future?

Quote from FluGan :

is it possible to make that feature in the future?

if your name is Scawen, then yes...

It's been suggested in the past, in various guises. We often discuss ways to encourage Demo players to make the move to S2, over in the Improvement Suggestions section. One of the best discussions I ever read is here (click me!)