Alright - I was under the assumption that I had heard the same from higher staff ranks back then, too. If I am mistaken, I support this suggestion (and of course my original one, too).
Just give GAs the worldedit.biome.set permission - This allows them to do applications of this sort while making sure they can't use other WE commands that can actually mess stuff up.
I would really like this, parts of my town look great with a nice green plains color and parts look kinda bad with an ugly dying desert grass color
Just like what Jacob said, I have parts of nice looking areas and then ugly colors of grass from swamps. :/
+1 yeah, why not. You can give the permission to GAs as @UnitedStates2 said without actually giving them permission to do other things (such as set, stack, replace, etc). Not much of a hassle besides adding a permission to GA rank and an application form. (Psst. Don't we all hate snow biomes)