no, these tiles just limit speed in any direction. The minimum value is 1 allowing you to fall slowly. You just set them in the editor with the max_speed value of the speedtiles
14:09
if you have seen the "slopes" from @Souly, I am working on real slides right now, and not some speedtile with weird value abusing(edited)
will look into the crash when you change the seed, thats not affiliated with the reference layer tho, it crashes with a newly created tileset without automappers selected(edited)