Disabling security warning triggered by BaseIntermediateOutputPath?

Our team overrides BaseIntermediateOutputPath (and other related properties) in our Visual Studio projects to create artifacts that go outside the main tree. However, this causes an annoying warning dialog to pop up when you first open a project in a new location (which happens on new computers, when you check out a branch to a new location, you need to delete corrupted .suo / .user files, etc.) ... Is there a way to turn off the warning?

FYI, we are using Visual Studio 2008 and we encountered this warning on Windows XP as well as Windows 7, so it is not UAC related.