[ffooky]

I think my router is the same model as yours and I went through EVERY method of forwarding, following the instructions to the letter before finally getting the green lights.
I use Azureus and enable the UPnP plug in in both Azureus and the router (Utilities->System settings->UPnP Enabling), but I think this will suffice for other BT clients.
Go to the Virtual servers page of the Firewall tab and create these 4 rules:

1.(description) Bit Torrent (Inbound Port) 6881-6881 (Type) UDP (Private IP Address) The IP you've assigned to your BT 'puter (Private Port) 6881-6881

2.(description) Bit Torrent (Inbound Port) 6881-6999 (Type) TCP (Private IP Address) The IP you've assigned to your BT 'puter (Private Port) 6881-6999

3.(description) Bit Torrent (Inbound Port) 7000-7000 (Type) TCP (Private IP Address) The IP you've assigned to your BT 'puter (Private Port) 7000-7000

4.(description) Bit Torrent (Inbound Port) 6969-6969 (Type) UDP (Private IP Address) The IP you've assigned to your BT 'puter (Private Port) 6969-6969

The Azureus UPnP creates these rules:

(description) Azureus UPnP (Inbound Port) 6881- (Type) UDP (Private IP Address) The IP you've assigned to your BT 'puter (Private Port) 6881-

(description) Azureus UPnP (Inbound Port) 6881- (Type) TCP (Private IP Address) The IP you've assigned to your BT 'puter (Private Port) 6881-

I think the rules regarding ports 6969 & 7000 are to do with running a tracker with Azureus yourself, but to be honest I was so chuffed to actually get the ports forwarded I haven't wanted to change anything.

HTH