Backspace is indeed the most useful, but others are too, especially when using the terminal. For example, we don't have an email client on touch so I use mutt in a terminal. I need to use h, j, k and l to move around. If I have 200 messages, I have to tap 'j' 200 hundred times to go to the bottom of the list of emails. I think a double-tap hold might work well, but I'll leave that to others to decide.
Backspace is indeed the most useful, but others are too, especially when using the terminal. For example, we don't have an email client on touch so I use mutt in a terminal. I need to use h, j, k and l to move around. If I have 200 messages, I have to tap 'j' 200 hundred times to go to the bottom of the list of emails. I think a double-tap hold might work well, but I'll leave that to others to decide.