A lot of other settings can be changed on the fly here. Being able to change the parallax scroll speed would be handy for easing in and out of parallax scenes like elevators and anywhere else you want to create the illusion of changing velocities from a stationary POV.
Change Parallax Speed
See “Add Parallax” event
another one submitted FR about it before, pls upvote that, here the link https://001gamecreator.com/idea/edit-parallax-parameters/