please add 'sexy delete' feature from Siine keyboard

[jmhman]

I would love to see the so called "Sexy Delete" feature from the Siine Keyboard implemented. Basically, it allows continuous deletion (backspacing) not as long as you hold the key down, but as long (and as much) as you wiggle your finger against the delete key. It's hard to describe, but the end result is that you can delete a lot very quickly but also very precisely, without ever accidentally deleting more than you wanted to.