If I could change one rule, it would be....

[constable]

I personally like the 4 quarter system. It gives you the chance to possibly prevent some book keeping errors from coming back to bite you later in the game. It is also nice to get a breather for 60 seconds.

In the grand scheme of things, is an extra minute between the 1st and 2nd and 3rd and 4th really that big of a deal?

Speaking of speaking up the game, I do enjoy FIBA's rule for the penalty. Fouls reset after each quarter, 2 shot penalty on the 5th foul- makes for a smoother game than FED.

Also, in FIBA if you are entitled to a back court throw in in the last 2 mins of the 4th or OT and you call a time out, than you get the ball at the throw in line in your front court.