1) Official Unity documentation is already fetched for the methods that do have documentation, but not all methods do. Usually only the first one of the variants (overloads) does have documentation to be fetched. I will also take a look at the possibility of adding a button to open up the relevant docs web page.
2) To be honest, this is something I don’t see coming, because I think it is quite unconventional and may potentially lead to more confusion that do good. Sorry :/