Hi Ross,
Scrolling menus aren't really a viable option right now. The option you see mentioned in a comment (from an older array file) refers to some functionality that the Milonic crew had been experimenting with a while ago. You'll notice that the comment does not appear in the more recent downloads/examples. That's because the option was not fully implemented... it was just an experiment at the time. Nevertheless, the scrolling code is still in the base script, so you could try it if you like. Be aware, however, that the option was never fully implemented, so it may not work to your satisfaction. The only example I know of is at
this site, in the "Galleries" menu. You'll notice, however, that the page is dedicated to listing problems with the approach. So, you might want to consider Tim's suggestion and break your products menu into smaller pieces, perhaps following some sort of product category.
Regarding your second question... I'm not sure what you mean by "sticking." I can tell you that if you want a transparent color, it's best to use "" (a null string) in the appropriate spot within the style array. If that doesn't help solve the issue, perhaps you could post a URL, so we could see what's happening and examine the code behind it, to come up with a solution.
Hope that helps,
Kevin