Last year following the Championship I made this thread:
http://www.chiefdelphi.com/forums/sh...697#post856697
This year when my team didn't make eliminations I decided to do a bit of first hand research to see how easy it was to walk out into the dome during eliminations, and I found out it's really really easy. I found that all it takes is a Drive team badge (Doesn't have to be a team in the Eliminations) or a media pass. One of those two things will get you almost anywhere on the dome floor.
I don't know if there's an easy solution to this problem though. The only way I could see limiting access to the dome floor would be to give a list of all teams involved in the eliminations to the volunteers, and request that they get rid of anyone not involved.