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Disable VBL sync on per-screen basis?

The secret option to disable VBL sync can give a massive increase in performance in the case when you have a single QC composition stretched across two screens, which is an odd but fairly common configuration for some QC video art pieces. Disabling VBL leads to image tearing, which is visually unappealing depending on the content being displayed.

Question -- is it possible to disable VBL on a per-screen basis inside QC? In many cases, screen #1 is a UI screen not visible to the public on which VBL can be safely ignored, whereas screen #2 is the performance screen where syncing with VBL would be nice.
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