The way I see there are three types of mapping work:
1) building new maps from scratch (can include nr 2 and 3)
2) tuning the number and types of monsters and pickup items in a map
3) technical go-over (fixing errors, optimizing for speed, adding scripts, setting the travel map exit and entry points etc.)
Question is, for which types of this work should we recruit primarily? I.e. do we want someone who can populate a map masterfully with just the right monster groups for great battles, a tech wiz who fixes and tunes minor things on mostly finished maps, or traditional mappers?