I posted an update which includes support for BYOND's new pixel movement feature. You can use the library's API to access the new feature. All demos that come with the library and any project you had that used the library will automatically work with BYOND's new feature.
The library defines a compiler flag that you can use to switch between the native pixel movement and legacy support. The legacy mode is needed for features not supported by the native feature.
I don't have any large projects of my own that use the pixel movement library so it's hard for me to really test this. I have projects that use the sidescroller library so I can be fairly sure that once Tiny Heroes runs the same way in both modes that the library is correct. For the pixel movement library, I'll just post the version and see what doesn't work.