The bandwidth selector in the uplink configuration would be the total bandwidth for the circuit. If you have 1 user using 2Mbps on a 10Mbps circuit you should be fine. If you have 5 users all using 2Mbps each at the same time, then you're going to saturate your circuit. If you want to limit the amount of bandwidth a user can use, then you can set the per-client limit in the global bandwidth limits.