Other voip providers seem to be able to supply traditional 2/4/6 line service resembling physical pbx systems, so why can't RC?
If the infrastructure is the limitation, perhaps there should be a point at which RC looks at the bulk of feature requests that have been made and there is a realization that some features need revamping. If RC would take a step back and fix the structure then many of these requests would be solved.
Honestly, if RC could create a true virtual pbx system they would rock. Their service is generally great and they could dominate the field if they would get up to speed with a realistic look at business needs.