So I thought that after sync, disabling the consumer property would be as simple as unloading the syncprov module and removing the olcSyncRepl directive... this way:
### removeSyncprovModule.ldif ###
### disableConsumer.ldif ###
But the ldapmodify returned an error when trying to inject that ldif file. Such operations are not allowed on the consumer.
(basically removing and re-adding the schemas+data using slapcat and slapadd)
Since that, the consumer is not sync-ed with the producer anymore (good) but as I mentionned above, any attempt to modify the tree on the ex-consumer sides results in a modification on the ex-producer side and not on the consumer.
Is there any easier and working way to turn a consumer into a stand-alone master ldap server?