It would help if you could provide a link to the tool you are using so we can look up what you are talking about.
With your second issue about multi-select not working for states I found it does for me if I hold down Ctrl while clicking on the desired states. I use this tool a lot https://project-gc.com/Tools/NotLogged to help me locate potential FTFs. When I toggle on the multi-select, I can choose multiple US states by holding down the Ctrl button.
Autofill is always nice to help speed up the process but given the enormous number of states or regions within all the different countries it would be a bit impractical from a resources standpoint. When logged in, PGC would need to query the individual statistics to determine state or region location. Then, it would have to provide that location changing for every logged in user. I realize my understanding is very basic. Many people, to include myself, do not give a state or region of origin for privacy reasons. Mine is set to "somewhere in the Milky Way."
But, you never know, this may be added to the To-Do list so it never hurts to ask.