Back on topic, I dislike the designation between SRP and PRPs. I think there should be:
Metaplot - Guided by staff for cohesion, affecting the entire game or a large portion thereof. Some portions of this may be able to be run by players and staff alike, but the overall story should be guided/told by a staffer. The potential for large game-changing consequences could be present.
Sphereplot - Approved by staff and affecting an entire group of players, this could be run by staff or by players, but should have one person overseeing the entire plot from start to finish, even if individual stories/events are run by various people. The potential for medium-to-large game-changing consequences should be allowed, provided staff is ok with this.
Characterplot - Anyone should be able to run these, that highlight and affect a smaller number of players. Mostly these will have small-to-medium consequences that could affect the game, and anything larger should be at least run by staff.
And I really, really, REALLY think that if staffers want to run Characterplots for their friends, they should be able to. And if people want to run sphere or metaplot without being staff, they should be able to. It's up to staff to ST, drive metaplot, and make sure that the stories that affect the grid/game make sense within the theme and with the goals of the game. It's important to have a coherent vision. But I also think it's important to share the fun of STing, and to let other people do things too. And to remember that at the end of the day, staffers are people too - if they want to run things for their friends, then let them.
If they ONLY run things for their friends, maybe they need to not be staff, and can just be STers. But if they run metaplot and then also want to run something for a buddy? Who the fuck cares?
Also to Theno's point I rather agree there too. If you want to just RP a story that isn't "let's meet up and just chat", you should be able to do that. Whether that's considered characterplot or just RP is up to you. If you want to have it make a larger splash, then you should be able to choose that after the fact too. Sometimes when running a plot you don't expect people to just use claymores in a city gridsquare, but that's what they come up with so fuck - why NOT run with it?