I am wondering, if I can do seemingly simple task wit BTT as remapping fn key to trigger ctrl.
I am switching between my full-sized keyboard at work which I use the most and then 2 macbooks and their internal keyboards, where fn key is located on the topmost left, unlike on the full sized keyboard. It confuses me quite a lot and I would like to unify this, as I don't use fn key at all.
Of course, I have tried to simply record the keyboard shortcut, but as fn is a modifier key, it's not captured by itself.
Thanks a lot for any help!
OK never mind, as I asked the question, I have found out it's possible with default mac keyboard settings (modifier keys section) 
Just keeping it here for the others who may want to achieve the same and are missing the most obvious option.
Is this still working?
When I try this the fn key appears to be dead and is not providing any input.
The ctrl remaps without any issue but not the fn key.
Thanks
I am interested in this topic too. My BTT rule is: FN + any key == BTT script.
But if my setup is changing or my working place, FN on the right side/ no FN key, I really get into trouble 