[Feature Request] Change the way of controlling the game's speed when the Stunt Jump camera is active

[RecklessGlue540]

What should happen

GTAV controls the game's speed while in Stunt Jumps, with the mouse scroll.
IV does this by having you move the whole mouse around, and is quite uncomfortable to be honest.
Implementing V's way of handling this thing here, would be a nice thing.

Checklist

• Check the latest git build in case it's already implemented.
• Search for other requests of the same feature.