That's because the design of keyboard prevents it. There should be a gap between F4 and F5 and also between F8 and F9. If the gaps were there, I know I would u

That's because the design of keyboard prevents it. There should be a gap between F4 and F5 and also between F8 and F9. If the gaps were there, I know I would use it. On my desk where I use the Mac around 60% of the time, I have an USB keyboard that has the gaps and I'm touch-typing F keys on it. It's the only thing I really hate when I use the laptop's keyboard directly.