Two small features
1) Ladders: now that we have polygon "barriers", a lot of people make topographical maps. Right now the only way to "jump" to the upper level is with a warp. I think it would be useful to have a ladder that could just lead from one level to another. I think that you should still be able to jump down from one level to the other without the ladder (since that is pretty easy to prevent anyway, and the whole point is to have a height advantage).
2) Fog of War: allow the map maker to exclude areas from the initial mini-map. The specific reason I think this is important is because in some maps the middle region is important but the outer region is less so, and it might be good for the players to focus on the key areas first. Of course, it's also just a common feature that many games have and has some obvious strategic implications.