I am not sure I understand the issue fully, so please bear with me if I am missing something.
Since the ad idmap backend *is* read-only, isn't it to be expected that you cannot change the "mapping" ? Was it even possible in an earlier version of Samba?
I am also curious about what you are trying to achieve. Are you trying to override the uid handed out from the AD for a specific user on a specific machine?
I am not sure I understand the issue fully, so please bear with me if I am missing something.
Since the ad idmap backend *is* read-only, isn't it to be expected that you cannot change the "mapping" ? Was it even possible in an earlier version of Samba?
I am also curious about what you are trying to achieve. Are you trying to override the uid handed out from the AD for a specific user on a specific machine?