Humanoid.StepHeight would determine the maximum height that the humanoid could step up (for stairs/wedges). This would allow all kinds of control for places the player doesn’t want the humanoid walking/jumping to (since jumping to an object at a certain height allows you to step up it).
Humanoid.WedgeOnly would determine if humanoids could use stairs at all. If checked, humanoids would only be able to walk up wedges, disabling climbing on objects altogether that don’t have a wedge to help the player.
This would be incredibly useful for both platforming and control reasons.