Open a text editor and find the Xfire director, now open ua_plugin.ini. Add this to the bottom:

                                        

                                        [NUMBER THAT COMES AFTER THE ONE ABOVE IT]

                                        LongName=ThinkTanks

                                        ShortName=tt

                                        LauncherDirKey=HKEY_LOCAL_MACHINESOFTWAREThinkTanks(default)

                                        LauncherExe=ThinkTanks.exe

                                        Launch=%UA_LAUNCHER_EXE_PATH% -connect %UA_LAUNCHER_NETWORK_ARGS%

                                        CanBeUpForGame=TRUE

                                        

Save and exit. Fire up or restart Xfire. Volia. Every time the game updates you will have to put this in again- but it's worth it.

I still need testing- I'll be on xfire alot so you can test it on me- name is: racer445

I think that the feature that someone should implement is an auto-joiner - you double click on the XFire name and you join the game that they're in.
I'll try it out, anyways.