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There can be as many ports as the game requires. You need to add them all, see http://bt.custhelp.com/app/answers/detail/a_id/8790/c/346 for instructions
No, you need to add TCP port 1935 translated to 1935, UDP port 3074 translated to 3074 and ports 3478, 3479,3480 for both TCP and UDP translated to the same ports. Its a list of ports that need to be opened. You select the range 3478 to 3480 for the 3
1935 is a single port 3478 - 3480 is a range, just enter the start and finish ports. For 1935 start is 1935 finish is 1935, for the others start is 3478 finish is 3480.
If the game is working already without forwarding the ports (presumably by using UPnP), it will do nothing.
Nothing you can do with a Home Hub, you would need a third party router with QoS to prioritise traffic.