Tonight I got an idea for this suggestion. Please don't get mad at me if you don't like it, it was 3am here: I thought scrap had to do something special, because it can basically consist of anything, so I thought of something it could stand for. S.C.R.A.P., or Stuff Concentrating Random Addition's Percentage, added to a reactor with substances in it would increase the concentration of a random substance. However, I didn't think of a way to prevent one from just inserting the rarest of the ingredients and then just throwing in tons of scrap, and then adding the rest, but I'm sure there is a wa to prevent this. Maybe only let it work when there's a certain amount of substances in the reactor?
Another idea would be Stuff Changing Reactor's Aqua pH, so scrap inserted into a reactor with water in it would change the pH level a bit, maybe up to 1 up or down, so when you fill a reactor with pure water (pH 7) and add a piece of scrap, the pH could change to any level from 6 to 8, except 7.
Thanks for reading!