Recently, I was able to continue my work on the editor. I cannot believe the last piece of information I posted was in May!
This time I focused my attention on providing a more intuitive and modern interface, since the previous one was more hack-ish and old. I am currently working on the textures panel, like the one in my previous post.
Also, before I can finally release a first version of my editor, I would like to implement adding, moving and deleting objects/rooms, which are the barebones of an editor... and fix a few graphical bugs (on some levels, textures are mapped incorrectly).
I provided some pictures, as always :)
You can find them HERE