[Zope] a metric for killing DTML.

Like any site that's been around for a while, we've got a lot of DTML that shouldn't be DTML. We're gradually killing it, but we're looking at detecting stuff that _shouldn't_ be in DTML. One metric that's come up is "any DTML method that has 3 or more calls to REQUEST.set() is probably up to no good." Have other people found other useful rules of thumb about when to avoid DTML? Anthony