Hi.
Thank you for contacting us.
Unfortunately, it is not possible by default plugin options.
It is possible only by custom development. If you are interested, please send a request to our Support and we will provide estimation soon.
http://support.fruitfulcode.com/hc/en-us/requests/new
Regards.
I would suggest looking at WP-CLI for this:
http://wp-cli.org/
Enable maintenance mode permanently and then you can use these commands to activate or deactivate the plugin (where “webuser” is the user the Web server runs as):
sudo -u webuser wp –path=/full/path/to/web/tree/root wp –path=/full/path/to/web/tree/root plugin activate maintenance
(would activate the plugin and switch on maintenance mode)
sudo -u webuser wp –path=/full/path/to/web/tree/root plugin deactivate maintenance
(would deactivate the plugin and switch off maintenance mode)