Form validation config & dynamic

Thanks both for your replies!

@silentium: The reason I'd like to do this is because I would like to create a clear structure where everything is set. Thus I thought it'd be better to do it both in config as dynamic. I've got more rules in it, and this is the only part where there's only 1 rule in the holder. The next forms include 5+ validation rules.

@mwhitney: I think this is the best way of taking care of it in my situation, thanks! I'm right about to try it out.