Waiting room - Can I add individual email addresses vs. domain names to bypass the waiting room?

I have added the domain names for many of my clients to ensure they do not have to sit in the waiting room. However, a number of my clients have gmail accounts, and I don't want to use the domain "@gmail.com" because it would give access to too many people. Can I enter specific email addresses so individuals with a gmail email do not have to sit in the waiting room?