Warning Tags and Two Optional Text Fields in AO3 challenge sign-up forms?

[boundbooks]

Does anyone know if it's possible to have two optional text fields in AO3 challenge sign-up forms?

Also, is it possible to change the labels on more form fields than "Prompt URL" and "Description"?

I'm trying to beta a sign-up for an exchange and I'm running into a brick wall as to how to best deal with warnings/triggers. Any other advice on how people have handled using the warning tags to match/not-match recipients and authors would be greatly appreciated!

edit - re: warning tags

As far as making sure people *don't* receive content that they don't want, would it make more sense if I *got rid of the warning tags completely* and simply had people leave their 'dealbreakers' in the text field?