Existing forum members might want to enter themselves under an assumed name, but at the end of the day I don't think it's necessary. Scripts will be selected based on the writing, we'll probably not even look at the authors name when reviewing entries.
Lots of folks asking about some parameters for being a professional. We can't answer for every circumstance but I think some self judgement might be sufficient - you know if you're a professional comic book writer or not. This is intended for new talent trying to break in, but that can include folks who've maybe had a couple of short stories in print here and there for small press.