Feature request: save-as-user

[Quey]

Hi,
Is it possible to request a new feature that will help out some of us  
doing many mirrors, that is each mirror has their own system uid for  
security puroposes, it would be of great advantage (to I'm sure very  
many) to have an option to "save as user" <some_user>  rather than  
have the files/directories only owned by the mirror host side
owner/group, or by root.

maybe something like a --chown user.group


Thanks