Add 'include' pages aside from the current 'exclude' feature.

[purplecodes]

User suggested adding an option where one could activate maintenance mode only for some pages.

This is kind of a counterpart to the Exclude feature of the plugin.

Ticket: https://wordpress.org/support/topic/activate-maintenance-mode-for-only-some-pages/

[AndreeaCristinaRadacina]

One more -