[cjp]

You can split hunks down to individual lines.

Also git-gui can stage individual lines.

[MatmaRex]

You can, but last time I tried it was only via editing the diffs ('e' command in `git add -p`), which is unpleasant and sometimes pretty annoying (ah, how many times I missed the leading space on context line to have it shout at me with incomprehensible errors). (And yeah, I'm just using `git gui` for this now.)