Is it possible to change how the "fn" key works ?

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Is it possible to change how the "fn" key works ?
I got a quickfire tk, and the problem is, if I have the fn key off (If you push it for enough time, the key become "on", and the "F" keys become like up the volume, you know) and I maintain it while pressing another F1/2/3 etc for too much time, it toogle the fn function, so I need to disable the fn function each time I want to up the volume or something like that.T he logic would be to don’t enable the fn function if I maintain the fn key with another key, you get it ? Is it possible to change that ?