BoopMcGoop

Hey all, Forge was made so that multiple mods are compatible, but I understand that FML exists and behaves slightly differently, and doesn't lock you from editing base files, only creating new files to handle multiple mods that add items and blocks. Does anybody know of a way to do any of the following? 1. Edit base files with Forge installed 2. Only install the forge modloader and not the rest, to allow modding similar to Risugami's Modloader 3. Create second versions of the edited files and have them overwrite the original in a way For reference, I plan on adding some flags and states to the base Entity class and the World class to create a player-exclusive stasis, but I'm struggling to find a way outside of editing the basic files - one can't just make a new version of each, as you'd have to then recreate every class it's referenced by, which is in essence all of them