Hey @trentrichardson, and thanks for the response! The best I could figure in the meantime was to initialize the prompt differently in each branch, like so:

    if (user.isSignedIn) {
        states = {
            signOut: states.signOut,
            signIn: states.signIn,
            register: states.register
        };
    } else {
        states = {
            signIn: states.signIn,
            signOut: states.signOut,
            register: states.register
        };
    }
    thePrompt = $.prompt(states);

But it’s definitely better to have true support for this in the extension itself. Excellent!