The bug
It is not possible to rebind the functionality that permits changing speed in Spectator mode while scrolling.
Fixing this would probably require allowing controls to be bound to scroll wheel movement (MC-268284).
How to fix
Add two new entries to Key Binds: one for increasing speed in Spectator and one for decreasing speed. One would be bound to scrolling upwards by default, the other to scrolling downwards.
Linked issues
Comments 1
muzikbike
Thank you for your report!
After consideration, the issue is being closed as Invalid.
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