I use DNS-SD myself for printer, scanner and multimedia discovery (and many others, too), so I wouldn't want to have this enabled by default.
Yes, but this option doesn't apply here. We use dnsmasq's config option bogus-priv to achieve this, however, it blocks only forwarding of address-in-arpas. To be more precise, the function in_arpa_name_2_addr() is called on your domain and when it sees anything non-numeric (like lb), it says: "Not my business - handle as usual", not extracting the address and, hence, not triggering the bogus-priv option.
In the end, this all seems to become more and more tailored and I rather think this should either become part of an existing FAQ like
or maybe even become its own Wiki article where users can properly describe and add their own findings. This way, users can subscribe to these topics and always get informed if new things are added.