How to deal with Azure AD guest users

Is there already a best practice, plans, ideas, ... how to deal with Azure AD guest users?

Should they be managed somehow by identity manager? If yes how?

Are there already known plans to address that "feature" in identity manager?

Another topic is the PIM in Azure AD.

In identity manager 8.1.1 we have the privileged account governance module. It supports Safeguard out of the box and "marketing" tells us, that we also can use it to connect to other PAM software.
Should PIM be integrated as well?