On a similar, but related topic, I was thinking that it might be good to have a restricted user for special customers.
Currently, for some of our bigger projects, we give a customer a full OnTime licence. This does start to get expensive. The reason we do it, is because we want them to manage part of the process, eg: UAT and they then sign off through their user ID. We can also assign issues to them, mainly for approvals and testing.
It would be great to be able to buy a restricted licence which costs less than a full OT licence and provides more functionality than the portal.