[feature wishlist] add commit subcommand to git add -i

when using git add -i, it would be handy to have a [c]ommit option.

This would save some typing: q # to quit git add -i $> commit .... git add -i <file> # to resume incremental adds

*** Commands ***
  1: [s]tatus	  2: [u]pdate	  3: [r]evert	  4: [a]dd untracked
  5: [p]atch	  6: [d]iff	  7: [q]uit	  8: [h]elp
  9: [c]commit
What now>

[f]ragment would also be handy, which would break each chunk of a diff into a separate commit, with the summary line provided automatically <file> @@ -696,7 +692,7 @@ int foo ...

This would help a bit with random cleanups, since rebase -i could then be used to reorder and recombine the fragments, and edit the commit messages afterwards.

going further, if git rebase -i had ability to "back" a fixup patch back to where it should have been, and adjust the intervening patches where conflict would normally happen, that would be awesome. Simplistically, this would just shift the patch 1 step back iteratively, until it wouldnt apply properly, and then --abort, stopping at the last clean rebase.

apologies if this is too hair-brained, or already done.