I have heard many discussions about one pixel property edit tool, but it was rejected because of copy and paste.
Suggestion: When prop clicks on a particle, it edits that particle only.
Shift click edits a line of particles, the same type or not.
Control click edits a rectangle.
Control shift click edits like normal prop. (Flood fill)
Alt click allows editing different particles. (Like selecting desktop icons with control click)
I am open to suggestions, but please no flaming.
Suppose there was one particle on one side of the screen and one on the other. Alt click on both particles edits both.
For example:
O is oxygen, H is hydrogen.
OOOOOOOHOOOOOOOOOOOOOOOOOOOOOOOOO
OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
OOOOOOOOOOOOOOOOOOOOOOHOOOOOOOOOO
Alt click on the two Hs only edits the two Hs.