I'll answer what I can, and find out the other answers later.

The /u parameter is also being used
The remember user name and remember user password fields are there but are not turned on. Although you didn't ask, there is no password.
I don't know what version of OS for sure, but it isn't Win7. I think it is XP SP3. I'll find out
I will the delete and manual typing of the parameters.

Steve