The function now gets called every second, so you can't speed up the scroll per se, but you can return more characters than you are doing every second - if you multiply your mod function by 2 this would return twice the number of characters for example - though I'm unsure why you're multiplying by 100000, I think the number to return 1 character at a time given the second count is 86400. Someone can correct me if I'm wrong though!
The solution in that thread isn't a script, it's a GIF image that's been created and then loaded in as an image in a text box. In order to create it, look up a marquee gif generator in google and then type what you want to scroll in there, save the GIF and read it in as an image into a textbox. Not easily usable but it's the only fix bar the 1 second scroll!
.png "Luminary Alumni"){kind=icon}