Covers for the seat belt at the back seems like something they should have thought of from the get go. I hope they will fix it for you nicely (to avoid the plastic and cable ties).
Somewhat related, but can you get to the room behind the back rest (between the back rest and the rear bulkhead) easily? I know in the old ones, that's not a problem from what I've seen, and it would be neat to be able to leave your jacket there, or perhaps a warning triangle or something.
Also, I (still) wonder if the seat (the bum part) is detachable or can be made detachable by some sort of quick release?
I didn't even know that there was plastic hub caps on the hubs. I assumed there'd be none. Fortunately, that is easily and cheaply rectified, he he