Something I miss in the editor a lot is the ability to create my own objects. Let's say I create a cool building by combining different shapes. If I want to reuse this building I now have to shift click all shapes and press ctrl d. Taking it with me to another map is out of the question if I don't start by copying the map I'm currently working on. So grouping shapes and making my own objects would make things a lot easier when it comes to creating cool stuff.