A few suggestions for the exchange that might make life quite a bit easier (so we don't have to search through 2000 Positron/Gravitron/Tachyon Deflector Arrays just to find that one Regular Array to craft at the very end):
Search Exact Name: Only shows items with the exact same name as what you type into the search box
Sub-categories for larger sections
Filter by Price
Filter usable: Only show items you can use
Filter Affordable: Only show items you can afford
Another thing that might be helpful for tooltips is to change the text color of items to red if you can't equip them. For example, If your a Lt. Commander and the item is for Captains, the word Captain would be red.