I have just realised that decimals are no longer accepted by the system editor. Why? I was using them to make planets with as few mexes as possible because even setting the mex density to 1 generates so many mex that you can very easily abandon other planets, create an orbital stalemate and still live normally with this one planet. I must request that decimals be reenabled or that a better scaling system for amount of mex be made.
It's might be just result of fact that Uber fixed several crash issues (in system editor all input validation is done by UI) and accidentally remove some feature too.