Understood.
The method of clicking the scroll wheel and just moving the mouse slightly in either axis, means my fingers are fully relaxed and not wriggling about scrolling 2-3 lines at a time, which what I took to be your issue.
To make the Launcher compatible with every mouse with a scroll wheel, outside of the OS settings, would require considerable code along with adjustments open to user preference, that they would need storing to make that sticky. It is doubtful Epic will do that, unless the masses demand it.