Hello Mike
The 'Disable Meridian Flip' option allow the mount to cross the meridian without performing the Meridian Flip. It is very helpful for Equatorial single arm fork mount as M-uno and M-zero.
That option it is there because the StarGo has been designed for control all our mounts (and several third party mounts). But since you have an Equatorial german classical mount as the Linear, you can ignore it.
Best regards
Stefano
Avalon Instruments Team