In https://github.com/sorah/hocho/blob/master/lib/hocho/drivers/ssh_base.rb#L48 there's the check for keep_synced_files which is not defined anywhere. Looks like this feature didn't survive dec1dab and f4a4576. Though it would be great to have: sometimes debugging on an actual server is the only way to go.
If you are ok with such feature I'm willing to submit a PR.