you can manually set the UnexpecedDialog behavior in code like this:
Settings.Current.UnexpectedDialogAction = UnexpectedDialogAction.HandleAndContinue;
As you can see this line of code manually access the Settings file associated with the test and sets UnexpectedDialogAction=HandleAndContinue. You can put this coded step at the beginning of each test that will encounter unexpected dialogs. I haven't tested it but this code will probably also work if you put it in OnBeforeTestStarted (reference
Please note that when you set the UnexpectedDialogAction in this fashion it will work even for test executions not associated with a TestList per se (e.g. Quick Execution, from CMD usign the ArtOfTest.Runner.exe etc).
I've attached a test which demonstrates this.
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