Is it technically possible to make mods for use within the Editor?

[Celsus_Trueword]

What I mean is mods which are intended to add functionality or enhance existing features in the Editor environment.

For example:
- A null recipe to allow Chemical Plants and Refineries to have Modules inserted.
- Even better, allow the setting of recipes on machines from all tech levels.
- Adding Shift+LMB/RMB copy/paste of recipes between machines.
- Drag-select multiple machines and change recipes/Modules en-masse.
- Blueprint-style copy/paste (including flip/mirror/rotate) which places the actual structures and belts, etc.
- Show Roboport connections as they are being placed and on mouse-over.

I'm not requesting mods that do these things, just wondering if there are any reasons which preclude mods working in the Editor at all.