as it works today findAndModify calls lastError and returns a getLastError object as part of the command. However this does not work for replicasets as there is no possibility to to pass w and wtimeout to the command so the drivers have to execute a lastError command again after the findAndModify. So my question is can we 1 let findAndModify take w and associated parameters or 2 remove the lastError call as part of findAndModify to make it work as insert, update and remove ?

I would prefer option 1 as it does not break backward compatibility.