Everyone is talking about his preferred RTS game and just sees the things that are missing in glest. Glest is not Spring , Glest is not AOE3 glest is not Warcraft3 and glest is not Starcraft. Glest is Glest. Please keep this in mind!
But of course there are some things which might be nice to see in glest. So what feature(s) do you have in mind which would fit to glests gameplay?
( and comparing glest and spring, I don't think that spring can handle this huge amount of trees and objects in a map, or am I wrong? As I said, I think its not a good idea to compare these games, these are simply different games with different gameplay.)