I am a common user.
I have set "showdead=1", the choice is there as some people may want to not see at all the dead posts, while some other people may want to see them anyway.
You asked a few questions and I gave you some answers, according to my experience.
The page you provided as link, very likely was seen as a confusing mishmash of several projects, IMHO you should (in your next post) give some more info, the very little info that is on that page:
>Kraker Local Proxy Server is a tiny server based on Node.js which is a popular open-source web server development platform. The server is used by Alleycat Player to access websites which would normally be inaccessible due to browser cross-origin restrictions. This is fully explained in the installation instructions.
>A recent upgrade provides an additional feature. This is a Socks5 tunnel proxy which you can use with your web browser to select your preferred DNS provider or to bypass the DNS altogether. You can also access the Tor Network automatically for ".onion" links. This requires installing the Tor Browser or the stand-alone Tor client.
needs to be looked for, and many people won't take the time to scroll and find it.
You should (still IMHO) expand the info and place (a copy of) it on the actual project page:
https://8chananon.github.io/Alleycat-Player/current/download...
which is the URL that you should post a link to.