WUA Api get updates from WSUS server

Hi

I have a question. Is is possible to make WU get update from a WSUS server other than ssManagedServer option?
ssManagedServer option requires setting up client computers with GPO and all.

What i want to achieve is to use 'ssOthers' option and let client specify the server url. But from documentation the server url
is get only property ... is there a work around for that?

Thanks,
umibau