Omitting "root" as the user name leads to blocked testing screen

When configuring a new Boot2Qt device, the user needs to fill out a form with parameters. Since this form does not provide any reasonable defaults and mandatory value, it is very tempting to just add an IP address and leave other fields as is. If the user omits to enter "root", the user name from the host is apparently taken as a remote login on the target. If after this the user hits the "Test" button, the test screen starts failing on each single command and block the UI for a long time. The user needs to cancel multiple popups asking to enter the pwd on the target for the local user... See the screenshot. This is not a good user experience, IMHO... We should either provide functional defaults or have hints on the UI what to enter right way