Hi,
I use “split at curser” at the beginning of the breath then “cut head” at the end of the breath.
I have programmed A , S , D QWERTY keys in key commands as Cut Head(A) , split at curser(s) , Cut Tail(d)
One hand scrolls while the other operates the editing key commands A,S & D.
Or hold "ALT "and mouse click to split at cursor , then with the mouse trim the head of the file up to the beginning of the next word.
Cheers
Mike