Allow SJM. There all whole areas of some arts not allowed simply because SJM is not allowed. Hey, I know it's dangerous but I mean this *is* supposed to be mixed martial art fighting and it seems kina silly to leave out a whole area of martial arts because it's dangerous. I think if you allowed SJM it would change the texture of te fights dramatically as people altered their attacks and their defense.
How about requiring people to hold belts inat least two arts. I mean, it's ""Mixed Martial Arts" If you don't require people to actually study the arts, then just call it "Sport Fighting" and drop the pretense of Martial Art. Learning three Muy Thai knee strikes, boxing punches, one Taekwondo spin kick, and a BJJ shoot is not Art
Faster rounds and more of them. Hey, the cops are coming and the dude's friends just showed; take him out *now*...or start over.
Open Tournaments - every one show up...random seeding...fight who you fight. No more preparing 3 months for just the *one guy* you are going to face (If you go with fewer faster rounds, maybe you fight 3-5 guys in one night)
Just some wild thoughts