I'm probably going to be the voice of dissent here, but I come from a MUCH different MU* background than the traditional WoD MU*er.
- Staff should not play characters in positions of IC power
I've never understood this, but I have never been in a game where a staff PC, who was in a position of power, was abused. Now, maybe that's because of some of the background of games where I've been have most all been consensual RP, but at the same time, that doesn't seem to be an issue. The issue is asshats who abuse their power, not the fact that they're staff. On Megaman MUSH, I freely admit that I was a staffer and played a fachead. I also did this at a number of Transformers MUs, particularly my own Beast Wars MU, and Transformers: Genesis. And it was something that just happened on games. People apped for their characters, they got them or got denied, and... they played. They did their stuff as fachead and staffer and never really had issues. Or at least in my experience.
I don't feel that having staff in positions of power is bad, no. Though I feel that, positions of power should really often be considered 'semi-staff' in general. TF2k5 treated the facheads and XOs of factions (for a while the XOs, anyway) as TP staff, responsible for helping out the flow of the game. It's something I am debating doing as a policy at Houses of the Blood, in order to help maintain cohesion. And it worked okay at 2k5, especially in the pre-trololol days.
- Staff can play characters, etc.
Mostly there, except for violation of point 1. If you don't play on your own game, you'll lose track of what's going on, on the ground. And most of us, I think we build games we'd WANT to play on (I know I do).
- Metaplot/stuff
That's fine. That's pretty standard.
- Staff is not operating as a staffer
Unless the caveat is that PC is treated as part of staff, and has a responsibility as described above. Otherwise, yes, no murderkills for pissing someone off and such things. You can't fix this without removing asshats through, which is the hard part.