In theory this should be fine. In practice though, a lot of third party software (and an embarrasing number of official RPMs - cf. #12423, #12424, #12426) installs binaries owned by "bin". If a dedicated uid is deemed excessive, perhaps a generic "rpc" account, which could be used by other things like rpc.statd.
Confirmed as still valid in beta3
This defect is considered MUST-FIX for Winston Beta-5
This defect has been re-classified as MUST-FIX for Winston Gold-release
Still valid in beta5