[tremon]

I use a 70-key Redox, not sure if you would classify that as a tiny keyboard. I have all the navigation keys available in my primary layout. Since I'm a vim user, I mark words exactly as I would on a normal-size keyboard: using vW.

I do not have F-keys in my default layout, and I don't miss them as I rarely used them on a normal-size keyboard anyway. But if I do need them, they're just one layer shift away: Fn+1 gives me F1.

Do note that layers can be activated permanently, not just through chording. In my layout, tapping Fn twice turns the right half of the keyboard into a numpad layout so I can do quick data-entry. And in that layer I also have a Tab key under my right hand so I can do both horizontal and vertical data entry. On a normal keyboard, the missing Tab key always forced me to keep both hands on the keyboard when using the Numpad.