You will need to integrate it with vIDM in that case.
I think you might be able to have them 'bookmark' the following URL and just use that:
This will prompt the URL to use SSO, if available. Otherwise, you'll just have to use AD and have them authenticate via AD.
However, please keep in mind that vROps cannot modify VC or SSO users permissions within vROps. The best way to manage users/permissions is to use local accounts or AD.