custom fps limiter/override for frame-step play/mute

Expected behavior of the wanted feature

as far i understand frame-step play just play the video at current speed to the next frame
holding it is kinda fast for regular videos, for really low fps content like gif its actually slower than using frame-step seek and single press will be laggy because it "plays" to the next frame
holding frame-step seek do it slower but very often with high res and heavier codecs it do it extremely slow (to the point that it is better to play the video at a low speed)

it would be nice to have a custom fps limiter/override option that will play at needed speed and for lower fps content it will speedup until it reach next frame

while searching i also saw this comment about using backwards playback for backward frame-step, could this be added as experimental option?

Alternative behavior of the wanted feature

No response

Log File

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Sample Files

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No files or tests are named; begin by locating the existing frame-step play and frame-step seek handling in mpv. Define how a configurable FPS limiter or override should affect forward stepping, then assess the proposed experimental backward-playback option and verify behavior with low-FPS and high-resolution or heavy-codec videos.