--rsync-path = 'blah blah'                 # might be spaces before/after equal sign
--rsync-path=/usr/bin/rsync                # no quotes around value (assuming this is allowed by rsync)
--rsync-path="blah blah \"blah"            # double quotes, with possible escaped quotes
--rsync-path='blah blah \'blah'            # single quotes, with possible escaped quotes
--rsync-path='blah blah' --another-option  # additional options might follow
--another-option --rsync-path='blah blah'  # additional options might precede (and follow)

# any other tricky alternatives I'm forgetting?