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I will invite the subject matter expert on the Free Bonjour Gateway to look at this thread to answer your questions about how to request more instances.
How many services are you offering via the Bonjour Gateway? I wasn't aware of an explicit limit on the number of VLANs, only on service advertisements (500). If you had 50 services available on one VLAN and readvertised them to 3 other VLANs that would still only be (50*4) or 200 services, leaving you with 300 more that the Bonjour Gateway could still support.