Welcome to Edge ownership! I think I have heard mention of only 1 other person in a similar situation, and that was with his dad (http://www.fordedgeforum.com/topic/12051-13-se/). Hopefully he is still on this forum and can help you with your questions.
I have not seen any good aftermarket liftgate struts for our vehicles, unfortunately. Redline Tuning does make hood struts, but not liftgate. You could contact them for their insight on this though. Other than suggesting a rubber tipped cane or something of the sort to help with the liftgate, I don't know of a good solution for you at the moment.
There are some experienced detailing folks on here that will chime in, but if the trim is plastic/rubber (i.e., not painted), you can use several "pro" level products (after cleaning the trim) to enhance and maintain the shine: CarPro DLux, Duragloss 531, Ultima tire & trim guard, etc. Mother's Back To Black is a decent entry level product, but can't speak to the durability aspect.
No idea on the USB drive issue.