[eluser]Référencement Google[/eluser]
That make a lot of sense and I encounter the same problem, I would find very logic that we can set that in a config file.
I didn't tried it, but as the new 1.7 version on SVN has a complete new form validation library that allow to set rules in a config file, that maybe worth to try it. I am interested to know if it worked so post your result here.