FR: Disable maintenance mode for specific users or groups

[Googliola]

Maybe this has been requested before, but I could not understand all the issues here nor can I find an option to achieve it currently.

As a site admin / content-creator, it would be handy to see the normal page despite the site being in maintenance mode.
I am currently setting up my grav-site and want ot check my content but don't want others (as in guests) to see what is happening. Hence, it would be nice to control what users (or groups) can or cannot see.