What I think I’d have to do to achieve the result I’m after is set ignoreDeletes at both ends, but the documentation advises that this can result in confusing behaviour.
If both Desktop and Laptop have ignoreDeletes set, and I add a new file to Laptop, it’ll end up being sent to Desktop. However, if I then delete that file on Desktop, what will happen? Will the file get sent again or not? Will it get deleted from Laptop? How will the status of both devices show? I imagine they’ll end up very rapidly becoming permanently out-of-sync.