Probably me 
Using SpaceFn I had some trouble with spaces being dropped, and I’ve since created my own complex-modifications based on a couple available from the KE website, and my own thoughts.
-
Hold
space
– ijkl act as arrow keys
– yn are page up/down
– df are delete (backspace) and forward-delete
– er delete word right and left
– s delete to beginning of line -
Hold the
akey
– hj parentheses ()
– kl square brackets
– l; curly braces {}
The “hold the a” shortcuts are sometimes a little fiddly, ]d rather than getting “and”, I’ll sometimes get ]d as I did earlier in this sentence. The rational behind using a is that it’s on the homerow, and my pinky is sitting there most of the time.
It’s a work in progess.