sounds like extreme combat testing to me (and fun lots of it)In my opinion I'd like to have some form of skirmish map where you can choose what character or monster you are, perhaps have some chests scattered about with weapons in them and allow players a type of skirmish mode using a map you plan on reworking for a prelude release as to cut down on development time.
It'd be nice to have some enemy slider amounts to mess with, this let's players really get into the game, derive more enjoyment, as well as damper any sort of negative reactions the fan base may have if inevitable delays occur on your release. See major games titles such as the Warhammer 40k series, by Relic. When you couldn't be bothered with the campaign you had the option of loading a map, setting the teams, and jumping right in.
Rogue likes such as Dwarf Fortress also have seed options, or old school First Person Shooters with bot counts.
Having some kind of playable version that allows players to explore a few areas as well as fight a seeded map (tailored by a few options for even perhaps indirect roleplaying, like a ghoul infested towns where you set high human survivors to team 1, ghouls to team 2, and player to well, sometimes you choose team 1 and sometimes you're choosing team 3 because you're an ogre or a skeleton pirate with two swords. etc.) would be a great thing to test and play indefinitely.
But as always it is the developers decision, and that's just my 2 cents.