as the title says, Adding an option like this will be super useful when for example, Am Away and am the master and some friends are in the table, And then another friend entered the playroom, But I'm away, Now, When he wants to join he will be unable till i come back, Which will take a while in most cases, Which is not a good thing, If this option was added, It will make free tables much better from my point of view.

I actually like this suggestion! :) Sounds even better than a password protected table in my opinion.

This is a great suggestion.