I hate, absolutely loathe, no. 3. The on-sides kick is one of the most exciting plays in football, and provides a great risk/reward that few other plays do. If you get it, you have excellant field position and if you don't the other team does. For chrisakes, it's hard enough to pull off as it is and this makes it harder. Do NOT like.
As for the 25-yard rule on touchbacks, I also don't like it. It makes the kicking team more likely to kick it short, making the returning team more likely to return it, making the game more exciting.
The NFL tried to make returns a lot more exciting and ended up causing injuries, and then backed away from it. You would think the NCAA would notice that.