Currently the LfMergeBridge clone action sets the username in Mercurial.ini so that subsequently Chorus will use that name for hg commits. This is done with the user option passed to LfMergeBridge. There's no such user option available for the Send/Receive action, and there are situations in FieldWorks Lite where we might want to change the user option of an already-cloned repo. So we should allow the SendReceive action to take a user property, too.