I think Eliot's answer is most correct, since two copies of links would entail two user databases, and never the twain shall meet.
WIth each release ALex has added in more flexibility (even if it's been somewhat hidden) for multiple record types. The only feature truly missing at this point, is the ability to use a different database table in each topic, rather than just a template/template-set.
This is high on my list.
It's something that will be a part of the image gallery plug-in I'm working on, but only in a very restricted form. I don't want to (like to) make central changes to Links, since they would be non-portable across versions, and both my efforts, and the Links program are still in a state of flux and development.
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