If the main set is in a digital format (encouraging a laptop) with a dice roller, then it doesn't matter how many dice are being rolled as the program could be designed to handle the combat round. If going with this route, how about (I know this is farfetched) a player's application for iPhone/Blackberry etc to deal with important rolls?
If the GM doesn't stop this kind of player then they may do that, but I don't know any GM who allows unlimited rerolling. There's nothing wrong with using a point-buy system only though. As has been pointed out above - they allow us to make the sort of characters we want to play.