form api

I recently needed to alter a standard password_confirm field type in a form that I maintain. Apparently, setting '#maxlength' property on password_confirm form field has no effect. No helpful at all also proved Drupal FAPI official reference (oddly) which has no mention of password_confirm element(!). Anybody who knows why is welcome to hint me.

Long time no post. No time to post. Cest la vide, eh? Lets get to the point shall we?...

Abstract:
I'm implementing a site now with nice amount of self-crafted forms. Drupal of course. Drupal 6 of course.
Now, I had this problem with one of the forms when testing how it works (with the others I didn't reach that state yet):