I think that emerge's read operations (and no operation when --help is requested) should work for non-root users. I, for one, have a habbit of running as few commands as possible as a regular user, and see no reason why emerge would not print out the syntax help or package info for a regular user. As an analogy, FreeBSD's pkg_info, pkg_version and friends work for non-root users.
I meant to say "as few commands as possible as _privileged_ user", of course. ;^)
fixed in cvs