https://osu.ppy.sh/forum/t/360626Yoshiap wrote:
2 things actually:
1. F3 changes autoplay speed when testing. In every game mode except osu!mania, because that changes the scroll speed instead. So the first part of this request is to enable changing autoplay speed while testing mania.
2. While currently there is a way to toggle the autoplay speed to use double time, there is no way to use half time instead. It would be nice to have this option as well.
Note to drum drum: I'm not trying to advocate allowing mods while testing. I am simply requesting that I be able to view the map played at a slower speed in order to facilitate modding/mapping maps which are harder than the skill level that I can currently play at. (namely, https://osu.ppy.sh/s/318730) This is not the same as the feature request from 6 years ago.