I've been digging in to the editor quite a bit and I've had some thoughts.

- I will put this first on the list and separate. Undo. Even a single level of undo would save an endless amount of trouble.

- Relative and Absolute translations. The relative translations are great but when objects are rotated it can become a bit challenging. So a switch to absolute translation would be rather handy
- Changing the default tool to the resize function. It's pretty often that I click on the screen and move an object by accident.
- Asking for confirmation before editing the level seems a bit redundant
- Rotating enemies
- Enemies triggering enemies. The fact that enemy triggers can’t activate enemies limits some mechanics. Even if enemies couldn’t activate themselves
- Mass/Group selection. I believe the reasons why that would be useful are obvious.
- Triggered traps. Being able to link traps to triggers would increase the possibilities for level building in some rather great ways.
- Platforms that can start at a percentage of their travel path. This would enable some more complex timing to be done with platforms
- Enemy kill switches. Maybe that’s just me, but a switch to kill enemies on demand or end the level on command would be great for challenges.
- Better thumbnails. A view much like the camera view that disables the clipping in the editor so we can get pretty screengrabs for the level thumbnails

- Twitch spawn zones. This would be especially useful for closed level designs.
- Light sources. Some placeable lights would be novel. Limited to be sure. But a few.
- Cylinders. If we can set the wall width it would be preferable. But cylinders would be a treat.
- Opacity for platforms. We can make water to glass and beyond
- Pre baked letters. Sculpting them by hand really takes an age. I know not many people use this, but this is a list of thing I'd like to see :P

That’s all I can think of for now. Just some ideas to get the mind going. I'll add more if I think of it.