#1 it would be nice if presets would be grouped by categories, e.g. metals, transparent, plastics, fabrics, etc. Basic alphabetical sorting is not enough, especially if the list will grow larger in the future.
#2 don't know how others, but i hate when you can change presets just by hovering mouse pointer over contracted list and rolling the mouse wheel. Since mouse wheel is most often used to navigate throgh UI, i always feel insecure to accidentally change some parameter. I know that this is global "issue" in 3ds max, but maybe it's possible to override this behaviour? IMO, the best practice is, when user has to click on, or expand scroll list, before he's allowed to scroll through it with mouse wheel.