Okay, I won't bother with formatting or anything, just read.
My first Idea for a mod is one where you have to basically revamp the entire lighting system and have an item that gives off no (or little) light but keeps monsters from spawning.
My second idea is a lot more complex. It is for people who want to do speed edits without a server. It would include hitting a "time record" like button and then being able to rewind the time and move to a different position in the world to watch yourself do whatever you did all over again, get the idea? You could also have a "time lapse" feature where it fast forwards whatever is going on. It should also show your avatar. If You need to set up a basic server. Just as long as I don't need two computers running to record. Thanks!