ADD “MONITORS IN MIRROR” TO LUBUNTU

I would like to only use Lubuntu, but I have had a lot of trouble connecting to projectors. Ubuntu is super easy, just put the option “monitors in MIRROR” and ready, the relationship between the resolutions of the two monitors is defined. In Lubuntu and other flavours is a tremendous complication, you can not easy match the resolutions of the laptop with the projector. Would it be very difficult to add this option to put the “MIRROR monitors” in the Lubuntu LXQT? If any program (like LXRandR, ARandR or xrandr) has the option to put the “monitors in MIRROR”, why do not replace the default program of Lubuntu by that? Something has to be done in order to allow easy connection to projectors when using Lubuntu.