You can actually set the workgroup name with Leopard itself. Open System Preferences, Network. Select your Network Device (actually I don't think it matters which one since it should be a global setting, also I haven't testet it). Press Advanced and select the WINS tab.
There you can set your Workgroup name, as well as the NetBios name. It does not offer the option to act as master browser. But it worked in my case.

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