Yes, you can. Starting version 6.1 the license code is applied on the Viewer side only. The Host actually doesn't care who connects to it.
Let me give you an example. A flying duck can be shot at by multiple hunters, and different hunters can have a license to shoot a different number of ducks each. Their license doesn't tell what specific ducks they can shoot, it only sets the total limit. Also, the same duck can be simultaneously shot by multiple hunters.
So the duck is a Host, hunters are Viewers, however stupid this example might sound. :)
We are going to implement this feature together with a few other features related to the address book and generally how the records are shown.
Currently, our major priority is making the user/permission management system more advanced and immediately after that we will most likely get down to implementing better address book viewing capabilities, including the search function. While we could quickly make at least some search function, this would go against our rules to make everything as well thought-out as possible :) While seemingly simple a good search function is no trivial task nonetheless.