To those saying that "backgrounds are too wide", this is not the case. When a storyboard is present, the background is not scaled to widescreen. The only issue is when a storyboard is not detected (ie. when there are only a few storyboarded elements), and this will improve as I work on detection.
In other words, the issue with scaling being wrong is only happening on maps that has "flash" layers.
The other issue is clipping no longer being present, causing areas which were previously hidden off-screen to now be visible. Depending on how the storyboard was made, this may result in unintended behaviour.
I am working on both of these cases and not looking for solutions, but examples.