Feature request: autopopulate and/or hide acs & audience fields

Normal users don't know anything about SAML things like 'ACS URL' or 'Audience' - they just want to be able to log in and be redirected back to their app.

I know this tool is targeted towards developers, but presumably the fields on the login form for ACS URL and Audience aren't going to change if they're tied to a specific app. It'd be great to be able to autopopulate those with an ENV variable rather than have to copy/paste the acs and metadata urls each time you want to log in; something like

...
# Base64 encoded value of public key `cat public.crt | base64`
PUBLIC_KEY=
# Base64 encoded value of private key `cat key.pem | base64`
PRIVATE_KEY=

# Set default ACS URL (usually my.app/saml/acs)
ACS_URL=
# Set default Audience (usually my.app/saml/metadata)
AUDIENCE_URL=
...

Those values would then appear in the login form rather than the default boxyhq.com urls.

Added plus would be to set the defaults and then hide those fields from the login form entirely.

Start by locating the login form and the configuration path that currently supplies the default ACS and Audience URLs. Check how environment variables are loaded, then define the expected defaults and an optional way to hide those fields; done means the form uses the configured values and supports the requested hidden-field behavior without breaking normal login.