rsync compression options

[roland]

hi !
is the "only" compression in rsync zlib compression ?
i would like to rsync huge files, which are compressible very good - i wondered how i could use lzop as an compresion option.
unfortunately, rsync has no option "--use-compress-program=/path/to/bzip2,lzop,compress,whatever....", like gnu tar has.

is this just a missing feature which just has to be done, or would that just be impossible to implement due to "architecture" of
rsync ?

regards
roland