How about creating decayed plasma? I would find it useful.
How about fields that affect only red or blue particles? Like with creeper in cw2.
And a annoying (bug?) feature on the editor: I want to paint land, so I start with the brush size. It is in 21, so I drag it to 1 but my mouse continues out of the panel (because I dragged it with too much power) and paints land, still holding the mouse button down. If you don't understand I will post another video to show it.
Edit: https://www.youtube.com/watch?v=N19Y732-9Cs