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Thank you for posting your question. You can have users land directly on the signup page instead of the login page by specifying the screen_hint=signup parameter when redirecting to /authorize. You can combine this paramter with prompt=login to indicate whether you want to always show the authentication page or skip the page if an existing session exists.
There are 2 ways to customize the authorization parameters that will be passed to the /authorize endpoint. The first option is through static configuration when instantiating the client, like so:
The second option is through the query parameters to the /auth/login endpoint which allows you to specify the authorization parameters dynamically. For example, to specify an audience, the login URL would look like so: