OK, so basically you're on the business package so that you get an SLA (service level agreement). That's fair enough

I honestly havent had an issue with my 4Mbit connection with regards to bandwidth, but it does seem to depend where you live. Mine is shared out to the whole family (4 of us!!), including a bandwidth hungry girlfriend and step son
But - what I would have asked them to do, which would have been cheaper and less hassle for you, is to assign you ONE IP, and disable NAT on your modem. This would then behave identically to a domestic connection, and you could configure your wireless router in exactly the same way as you would for a domestic connection - using port forwarding on the router to get BitTorrent and your games working.