I know this is an Older thread, but I like the topic...
I've staffed on a few servers now, & am now running one for the second time. (First time, my computer blew up & the server was shutdown).
Anyways, I think & want any of my Staff to be both very friendly & interactive, but to be strict with the Rules I have set down. My Staff also have plenty of Rules they must abide by. I have 3 Books currently in our Staff area, that I remind them to check regularly for changes, editions, etc. These contain Rules for Players, Rules for Staff, things I want my Staff to pay special attention to, things I Don't want them doing at all, basic commands for some things, & general stuff to these degrees. If my Staff want to goto people to answer pages they can, if they want to answer using the official page, thats their choice as well. As for aiding players, that something I'm against. Unless its some very special circumstance of some sort, can't think of an example at the time though.
Honestly as far as 'hiring' goes, so far I've taken people I've known for a while as players, & then 'molded' them as far as Staffing for me. I still occasionally have to nag or check up on them at times, I really watch as best I can how they are as players then as low level Staff, etc. & go from there. Yes you can still end up with it going wrong, the 'power' can goto ones head.
Eh, it happens. Honestly... kinda happened to me in ways. Thus why I decided to Run a server.