Mikrotik User Manager shared users badnwidth

with reference to: http://forum.mikrotik.com/t/userman-bandwidth-on-shared-hotspot-users/46224/1

I have a user (1mb profile) who wants to use 2 or 3 computers at there home, so I set shared users options for him, but the issue is that when he conencts 2 computers with the same ID , 2 queues are created in QUEUES section, so he gets 1 mb on each computer, so in practical he can download 2 mb on both pc using same id.

How can I restrict his both computer session to use 1mb in total.shared bandwidth actually.

This is just an example, I have more then 100 users on which I want to restrict this restriction.