I've been in Omaha 7 years, and haven't done the "stage door" thing yet. Guess I'm getting too old.
I don't think it would be a problem though, especially depending on the show. If I were interested, I'd check it out be asking the personnel at the stage door. The actors might really enjoy it.
Omaha people do stage door especially for the bigger productions such as Wicked. When Wicked was here in May 2009, there were probably 15-20 people looking for autographs especially from the people that played Glinda and Elphaba.