Was talking about this with a friend today. I think that a couple of basic changes could really improve the game.
1. Refs should ALWAYS use the paint for free kicks, too many people inch up after they line up and it is just annoying.
2. Posthumous yellow cards & fines for diving, have review panels set up for all falls/dives/fouls whether called or not, you could allow for a certain number of appeals but double fines (or something) if you don't win the appeal
3. Goal line technology, this is just a no brainer
4. Add a second ref/assistant ON the field.
5. Only allow captains to speak to the refs, I may get mad at refs at times, but they need to feel safe at all times to do their job as well as possible.
Other ideas?