I agree with defining a legal slide in the rules. Might help to create some consistency between umpires for INT calls.
Longer distances for the SP pitcher's plate might also be in order. 50' is terribly close to HP with the bats that are used today.
Also, I had posted a
thread a while back about a player who, while running the bases, is ejected (or who should be ejected). Should we allow a runner to score after they've committed USC? Or should an out be called? Another thread was posted along the same lines for a runner who hockey-checks the catcher while there is no play being made on them, though I can't find it.