Desktop version: Right now you can use your left hand to tag a reference with I E and M but you need the right hand to move the cursor.
Could you add the option in settings to automatically move one down once the I E or M key are pressed?
Could you also - for those who don't want to move one down automatically - offer the option to re-map a key so it works as the down cursor? Examples are one of the function keys (F1-F6), the ~ key or the spacebar
Mr Francesco Favro commented
A small addition that would be helpful to have is a one handed set-up.
right now, if i REALLY stretch my left hand i can get to E, I and arrow down, but it would be a lot easier if i could just rebind the keys so that
W = arrow up
S = arrow down
D = exclude
Or something similar.
Have you tried the page down key?