Windows Logon name pass

Hi Remote Desktop Manager team,
i wasn't too sure if this was a feature request or scripting, but the situation i have at the moment is of having two different domain with the same username. What i like to do is to pass a variable like %username% to the Username field on Remote desktop manager.

When i was searching though the forum, there was a post which talked about any single sign on system is a bit challenging to implement , which i can understand.

One way i though i can implement this is modifying the .xml source file , where depending on the user , we can pre create a settings file, this is a solution but not the most ideal. Hence is there a way we can pass an windows environment variable like %username% to this field in Remote Desktop manager.