Crowd Aliasing should allow per Directories Aliases

Summary

As a system admin
I would like to be able to set a different alias for users with the same usernames in different directories
So that the users can be able to login on each application with the alias, allowing the same username to exist across directories, beloging to different people

Problem Definition

Customer has multiple directories configured in Crowd. The usernames are flattened, so that a jsmith may exist on more than one of the Directories, belloging to different actual users.
When user jsmith tries to login, only the one in the first Directory, in the order set in Crowd, will be allowed to login.
Customer tried to add aliases to each of them, but aliases are associated with the user and the application, and not with the directory:

Suggested Solution

Development could consider including alias associated with a combination of username+directory, not only username. So that we can have jsmithteamA and jsmithteamB (for instance) each of them associated with a different directory and user.

Workaround

Currently, the user has to be renamed, or customers should use another attribute for username which is not duplicated across directories, such as e-mail for example.
If the remote Directory allows alias to be added to users, and it is set for all users, that alias attribute could be used as username in Crowd too.