I'm working on a way to pass 'class:property' pairs as keys to the
'ignore' parameter of indexer.search[1], so the user can exclude some
properties from 'All text' searches.

While it's not exactly about "non-matching criteria in filters", it
makes me think that this RFE is implementable in
templating.HTMLRequest.[batch|_post_init] (as opposed to building
support for negative filterspecs in classes).

I'll give this a try soon :)

[1] http://psf.upfronthosting.co.za/roundup/meta/issue262