The version of systemtap incoming for RHEL5.3 is going to have a client/server feature that allows relatively "naked" machines (those without an installed compiler, debuginfo, ...) to use a a systemtap server on their local network to transparently build systemtap modules for them. Since this client will be very small (a few kilobytes, no new dependencies AFAIK), and would open up useful diagnostic capabilities, we should just install it by default.
This request was evaluated by Red Hat Product Management for inclusion, but this component is not scheduled to be updated in the current Red Hat Enterprise Linux release. If you would like this request to be reviewed for the next minor release, ask your support representative to set the next rhel-x.y flag to "?".