This home cockpit setting can be usefull for it is not impossible as it locks the cockpit in one place for example setup the cockpit to youre like in the aircraft you fly and set zoom and translate, than lock it with this mode and with ir headtracking you can still look around in any direction, so i set it to the edge where still i can see the nose in the bottom of the screen ,
If clicking the wrong mouse button than it would be still no harm done.
Maybe it doesnt make sense, but i think it is useable in some scenario.