Temporarily disable F hotkey

I'm working on an editor extension and I really like naming my own hotkeys in a logical fashion - A for Add, etc. I really need to be able to use F. The condition would be a simple boolean. When this boolean is true - rather than centering the frame on F, unity would allow me to execute my own command. Is this possible? Currently pressing F does both things - both unity and mine. I'm using c#, thank you all in advance!