I have no hand-written a command to add or remove members of your lot. You can use
/lotmember [lot_id] add [member]
/lotmember [lot_id] rem [member]
The nice thing of the new command is that you can use it no matter what world you are in. This is one of the biggest bug being removed that was introduced when upgrading the server. There are still a few around but most of them depend on other plugin developers so we will need to wait a bit until we are able to do all we want to.