Marcel Krzystek:
Add the following to your .torrc file:
ExitPolicy reject *:*
It's non-exit, not a "middle-only" relay. Jim probably doesn't want to become a Guard. I'm not aware of such option.
btw, we've recently discussed in #19625 [1] possibility of setting "peering policy". If this would be implemented one can restrict connections only to relays in consensus (but not bridges?).
[1] https://trac.torproject.org/projects/tor/ticket/19625 -- Ivan Markin