TyrionBean, in addition to what mouser and tomos said, if you use
Autohotkey I think you can make a small hotkey script that triggers FARR with ctrl+space unless some programs A B C ... are active. First set the FARR hotkey to the Break button. Then use a script like this
GroupAdd, nofarr, ahk_exe game.exe
GroupAdd, nofarr, ahk_exe anothergame.exe
return
#IfWinNotActive, ahk_group nofarr
^Space:: send {break}
#IfWinNotActive
Add one GroupAdd line for each process name that you want to take priority over FARR with regard to the control+space hotkey.