I want to disable F3+F4 and F3+N, as I was about to get a pb yesterday and I accidentally switched modes :(

That would actually be helpful to be able to disable those, I keep pressing F3 + P by accident because I use P to walk

If F3+N actually worked, then you need to turn cheats off. You can do /seed without cheats on. Cheats MUST be off

Doing COOP runs fam I need cheats to /set time 0

For certain keyboards, you need to press the "fn" key to activate F3. This is the only idea I have in terms of preventing accidental F3.

I don't mind using F3, its just that I fat finger them sometimes. I looked through the config files but I couldn't find anything that controls these keys :(