Although Area 51 Stack Exchange maybe more limited than the other sites you may not have a lot, BUT you still have something so by using these small things you can still help out with moderation.
Voting on example questions can be helpful to show which would be of good quality and which would be of bad quality, it can help separate what is good from what is bad.
Vote wisely and honestly!
Closing example questions that is off topic or not fit for the Stack Exchange format can help root out bad content and help with defining the site.
It is used to do stuff like discuss the proposals so why not join the discussion by giving worthful advice or answer some questions if you have the answer.
Doing those things can help out a lot because these things are part of the quality control system and it depends on the community and not just one man. (Although one man with admin privileges can technical do most of those things, so, uh.)