I wouldn't be opposed to the occasional one of these. Hmm. For example, a named Grunt with a Adv Heat Sink instead of an Imp model, and a slightly better gun. A named pair of Hunters, or Programmer, et cetera. Tweak the spawn rate so that you'll likely see only one every 3-4 floors - let them be occasional encounters and not overly different from regular mobs. I like it.
Probably a feature for near/at/after release, though.