I know this is laziness, but sometimes if there are a lot of maps in a folder and you want to see the script for a map, you have to go all the way to find the map then right click and open its lua. Maybe the map editor could have a button somewhere where you can simply click it and its lua will open. Maybe this button could be in between the Music tab and the tileset window?
Don't know if it would be too much work to do but I think that this could be very helpful for those projects with tons of maps.