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One minor tweak/suggestion I'd love to see by the way if possible, is having the "general" labels and the "heading" labels (i.e. the ones with custom backgrounds) have separate foreground values if possible. This isn't currently possible with EE1 (I have a WIP patch for that, but I'm not really a C++ programmer and am going to see if I can just add more UI colour options across the board, since there's a few other widgets with fixed colours too).
As there is no EmptyEpsilon2 yet (it's just a concept/random pieces of code on my machine) I assume you mean for EmptyEpsilon1.In that case, it's not a full fledged mission editor, there is the mission scripting guide:http://daid.github.io/EmptyEpsilon/#tabs=4Which explains how to write the mission code.And there is the game master screen, which allows you to create objects in the game world and modify them. And, it contains a very important feature for mission editing, and that is the "copy to clipboard" button. This puts a mission script on your clipboard ready to be pasted in a mission script with all the objects in game world at that moment. (You know, with [ctrl+v])That quickly allows you to setup objects in the game world without needing to visualize the positions from numbers yourself. (So this helps with the 2nd step of the mission scripting guide)