considering we use all of the major mods on forgecraft and only touch about 50% of the block ids. If that, I dont see how you're having issues.
If you are having block id issues, go yell at the mod author to stop using so many ids.
But the answer on our end is a simple one, No, it would fuck EVERYTHING up.
4096 is MORE then enough, if someone really wanted to work at it, they could write the entirety of the mod using ONE id, so ya.. Not gunna happen on our end.