Q: Can I skip the username/password dialog?
A: Yes. That's because VAOS is multi-user by default. That means you can use it for more than just one user. If you don't like the login dialog you can tell VAOS on the command line which data to use. Create a Windows shortcut to VA (if you don't already have one) and change the Target path (in Properties) to something like "C:\VAOS\va32.exe username password" where username is your username and password is your password. That simple.