Miriel, you're doing a fantastic job!
I hadn't considered that the booths might be modifiable, but then I'm Ms. Last Minute and so I hadn't really started to work on mine yet. /me looks at calendar... I'd better get moving!
Obviously I can't speak for all the other vendors, but if you need an easy life, and he/she continues bitching, I wouldn't have a problem if you allowed mod permissions on the big stands. Although I can see that once you start allowing teeny mods.. it may (will?) get out of hand. (Thinking of the jungle stands at the hair fair complete with menagerie)