Just my two pennies worth, the lack of replies is probably just due to sheer lack of activity & support on these forums, unlike the much busier BT Retail community forum.
In addition to any static routes, I would suggest you check if any firewall/port forwarding rules have been set up, I think they should be visible under the 'Status' tab.
The only other thing that makes the BT 2wire hub special, is they provide Openzone wifi hotspot. If you don't use or don't wish to provide this service to the public, then you can indeed use any different non-BT modem router of your choice.