The only suggestion I would like to make about improving the GUI would be to make lists, such as the inventory, be populated from the top down. Rather than having each new item added to the end of the list, it would be better if new items were added to the beginning of the list. If that is even possible it would really help with decreasing "scroll time". If you pick up a new item then chances are you wnt to look at it or use it right away, so it should be at the top of your inventory rather than the bottem.