To be able to give the exact sound we want to each unit (i.e : If I want to give rocket move sound to a infantry unit, etc)
The editor is a perfect tool for modding, and I noticed that the AI is very good in tactical aspects, the engine offers very interessant possibilities. But these two things are cruelly missing : it makes heavy limitations in creativity and it's too bad
EDIT : In addition => in editor, we should be able to choice what base we want for new maps (sea or ground). In the actual system, all new maps are in sea, and it needs lot of time to remplace sea by ground if we build map with no sea. It's a little details, but with heavy practical effects in modding.
And in the same spirit : we should be able to choice the size of the "cursor" when we place or erase grounds, ressources, etc : it would save lot of time (in the actual system, we have to work hex by hex, to work by multiples hex would be great) :we need for that the same tool game provides for national control of hex (ctrle, shift and alt keys to cover large surfaces)