I can see in the admin guide page 133 there is reference to UDP Relay.
You can try the page specific help text on the UDP relay section of the GUI, to see how relevant UDP relay may be to your NTP issue.
But what are you really trying to achieve, are clients really trying to sync with a NTP server broadcast that is on another VLAN ?
Seems a shame you can't unicast the NTP request.
You can try UDP relay, which I would have though was good for netbios port forwarding, but the admin guide does mention port 123 (NTP) within the UDP relay section.
If the SGE2010P is still under phone support warranty, you still have the option to open a case with the good folk at Small Business Support Center (SBSC) and get their advice or a solution to the issues.
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