I dont know how to fix that issue, but ones you get that figured out, i can recomend you setup search engines in qbit, as that is one of the best features, becouse then you dont have to go on 5 websites to find the movie you are looking for
Well, cloudflare is (supposedly) more secure, but other then that, not really, everything in nabu casa can be achieved without it, but nabu casa is easier and supports home assistant
There are lots, its a build in feature so you just press search and then you search, and it shows a long list