I agree that there is a need to keep a real close eye on things.
Increased publicity for yedda recently has seen a big upsurge in the number of questions posted (and I suspect a decline in the question quality - not that I want to judge in any way because as far as I'm concerned people can ask what they want)
I do worry that yedda will end up like yahoo answers - which in some sections at least - has become almost unusable due to largely racist abuse and other similar behaviour.
My suggestions would be to let things run for a bit with no major changes but be prepared to step in behind the scenes if things take a turn for the worst.