Originally Posted by https://wiki.srb2.org/wiki/MainCfg
TitleScrollSpeed sets the speed at which to scroll the title screen rightwards. 1 speed is equal to 1/16 of a pixel per tic. To get a speed of 4 pixels per tic, multiply the desired number of pixels per tic by 16. This integer does not support negative values. In order to make the title screen scroll the opposite direction, multiply the width of the title screen by 16 and subtract your desired speed - this will make the title screen appear to be scrolling the other direction when it is actually just travelling ridiculously fast.