The only correct answer is num lock. Caps lock is sort of correct, but it's a stupid key on anything that's not a typewriter so I usually disable it so the only correct answer is num lock. No exceptions.
Jokes aside that's an awesome keyboard, just not a useful one to 99% of users out there and I can honestly say I'm on the opposite end of customization spectrum. I have 2 aliases in my bashrc, but if I need to switch to a new computer I can be up and running in 15 minutes while the rest of the team needs 2 days. And even though I've had the same computer for the last 5 years, I don't work noticeably slower than anyone with a ton of customization on their pc.