Well, one does need to sideload two apps, a browser and then the corresponding xpi file which will install the add on.
There was/is an alternate way on Firefox Nightly, I think to create a custom add on collection which will add it to mobile Firefox normally. But yes, you are correct, only a miniscule amount of people would care to run it on Android(though it is always nice to have a workaround).
Same here. Whilst torrent sites themselves are blocked, once you get the magnet link/torrent via a proxy/VPN, there is no issue. I do not think anyone has ever received a cease and desist letter from their ISPs here. But then, I think, this is the case for many countries outside of the developed world.
There have been improvements, just on the fronts you haven’t been looking for. Also, if I am correct, torrenting over Tor would be painfully slow compared to normally doing it or via a VPN. It is not worth the hassle.