To answer your questions:

  • Yes, single site admin sees other *non-network activated* plugins on their site, so they can choose to (site-) activate or deactivate.
  • I can inquire with WPEngine if indeed this change needs to be maintained in wp-config.php; please confirm that I’ll need to maintain this change.
  • Thank you for preserving unfiltered_html capability within site for admins.
  • Single site admin role name has not been edited; it’s “Administrator.”

Hope this helps!

Jim P.