I decided to start on this a bit and see what it's like. I doubled the mob density for "Butcherblock Mountains: butcher" I haven't adjusted the X, Y, Z coordinates yet though so so spawns will be on top of each other currently. If someone feels like trying it out and spacing the NPC's spawn locations apart a bit go for it.
A lot of new ID#'s entries to create for each zone Butcher had 418 rows. For now I'm going to do this for Classic EQ zone by zone starting with continent of Faydwer and just doubling density, but that's going to be a time consuming enough project for the meanwhile. After that I may triple them or look into fixing the X, Y, Z coordinates and NPC spacing a bit if no one else has taken a interest in doing so.
Anyway here's the file to checkout and muck around with it. It's a start I guess more to come as time permits and overall ambitiousness prevails.
https://docs.google.com/file/d/0B1YE...dfM0FZR1E/edit