"If I'm not missing something else, you should be able to see the background being a few pixels misaligned." - Yes, that is correct.
Now, the only remaining issue with Stream friendly mode on my end is that misalignment issue. Previously, the only way I could fix it was by using that "Windows scaling workaround" I mentioned, which was too cumbersome and time-consuming. Fortunately, thanks to the new feature, I can now use the Still background button to mitigate this selection issue (for manga, for instance), which makes it much less annoying. I'm really glad that feature is available!
Thanks for all your help.