According to the rules, given that they distinguish between jumping, hurdling...and diving, diving over ANY fielder is illegal. I'm almost certain there is a case play on this. I'll post it if/when I find it, provided someone doesn't beat me to it.
In Hockey I can body check a player trying to score and not have INT/OBS called on me. Should I now also assume this is the same as bowling over the catcher?
I can't for the life of me figure out how diving in FB has any bearing on diving in BB.