Will you also publish this to userstyles?

Gotcha

Then how can you, for example, add a restart option in the client options dropdown menu?

You won't create any function
Just combine 2 functions: change to offline status > login to friends

Steam Chat can be buggy, so often I see myself signing off and on again with friends, by first changing status to offline and then sign in to friends again. I wonder if you can add a refresh button that does just that. https://i.imgur.com/vaZCdPv.png