range get reqests in rsync, please?

[Wojtek.Pilorz]

I am wondering if would be possible (and a good idea) to implement 
'get range' request in rsync, similar to --range option of curl (for http 
and ftp protocols), perhaps limited to a single file operation, with both 
source and destination files specified as parameters to rsync client.

It would be beneficial for those lack-of-disk-space situations, or when
just a fragment of large files is needed (e.g. to pick one file from an 
CD or DVD (or BD?) iso image).

Would that require changes to rsync protocol and/or rsync server code?

Best regards,

Wojtek