network.throttling.rate and vm.network.throttling.rate
I think you assumptions are valid. I believe network.throttling.rate controls the virtual router and vm.network.throttling.rate controls the guest instances, but it should be pretty easy to check. The default is just that, and can be overwritten by the offerings. You could either changes the defaults in global settings ( and re-launch and instances or virtual routers ) or creating a new offering with an override value defined.
I don't believe there is a way to limit which offerings are available to which accounts, but since I haven't looked into it, I could be mistaken.
--Mike





