Fortunately, I have discovered two good things going for me:
1 There is no javascript, just perl.
2 All the forms were auto-generated from templates.
Which means that any form I check is guaranteed to have only fields that the master template it came from has. It may not have them all, but it won't have any new ones either. And, they were nice enough to include a comment just before the <FORM> tag that tells what template the form was generated from. :)
Moral: Sometimes reading through product documentation pays off.