From what I can understand from your request list they're mainly related to issue that'll make signature managing less time consuming and easier, benefiting mostly signature mangers and not the forum in general so don't think theymos will have much interest in implementing them as he doesn't have much interest in signature and of recent disactivated animated avatar. anyway good luck with you request. I'll love to see some of them implemented.
I have much interest in seeing this one implemented;
When browsing through someones posts I'd like it if there was a sorting feature so that I could select a specific board and see all the posts the user has made on that board.
Aa it'll not only benefit signature mangers but might benefit spam hunters too as in regards to searching through specific boards for abusers