This is not really necessary or useful. By ticking both "Scope Centering" and "Solve and Sync" this first plate solve that occurs after the mount slews to the destination performs the required syncing of the mount. And as pfile says, the mosaic wizard is not related to any mount syncing when it is being created by the mosaic wizard. Only when actually running the mosaic sequences does mount syncing come into play. And definitely check both "Scope Centering" and "Solve and Sync" for all the targets the wizard creates.
As an aside, in a prior thread Ken suggested it might be a good idea to check both of these by default when new targets are created. I would favor this change.