No option to remap "fn" key?

Seriously, I’ve been reading about this and it’s not possible to change…. why?!!!!!??!?!??!?! It’s a 60% keyboard and I’m using the synapse software why would I not be able to change that? My plan was to turn that part of the keyboard into my arrow keys but now guess what? I have to return it cause my plan is ruined, why would you limit something like this? We’re gamers not grandmas, we know what we’re doing.