We are adding a contacts folder for our company, but there are concerns if everyone adds the contact list at the same time that it might slow down the server, so their idea is to queue users through a sql database so people are added 10 at a time.

My argument was that the BES must have queueing already enabled and this wouldn't be a problem, but I don't have a way to prove it.

Does anyone know where I can find documentation showing this is the case?

Looks like we do in fact need to queue users 10 at a time. That was RIM's suggestion.