Avoiding rom rcorruption tips

Will ZD corrup the rom if I add exits?  I want to connect the imperial base to vector.

Zone Doctor is a bit unpredictable though its level editor is a lot more stable than like the event editor. Try it and make a binary comparison between two ROM after to see if only the exit was changed.

Edit: You can use something like vbindiff or HxD to compare your hack and your hack + one exit change in Zone Doctor.