Is there any tethering app that will block Bittorrent, P2P traffic, and Youtube? I'd like to be able to share my wireless connection with friends when we're in places without easy internet access (i.e. on the beach, in the park, on a roadtrip) but I don't want to consume excessive bandwidth and possibly get noticed by ISP. This is only for light surfing or checking email.. any way to restrict throughput (amount of bandwidth per second) would be a plus. Thanks.