Hi Peter!
I’m afraid not. Windows Vista completely prevents 3rd party applications from changing the default sound device. Thus, a hard bypass feature is absolutely impossible in vista. This is also why the Breakaway installer has to make you open the audio control panel and make the change yourself in Vista, whereas in XP it happens automatically.
I’m afraid it’s just one more example to add to the long list of "security" features in Vista getting which get in the way of convenience, without actually providing any security.
Best regards,
Leif Claesson