Most of the time the joint that you describe works for me. Sometimes I use the side of my palm. It has worked for me on pretty much any keyboard so far, regardless of the height of the caps or the travel. On those with an fn-key I have had to remap the key somehow, sometimes in the BIOS sometimes using software. The exception is a smallish bluetooth keyboard I bought for a tablet. It's fn-key is hard to remap inside mobile OSes.