This feature doesn't seem to be implemented:
neither doe I get filter gadgets when adding e.g.
"filter=superseder" to the URL nor does
"superseder=1" have any effect (I can even
request garbage).

Any plans (or ideas) how and when to add
this? It might be less useful for superseder,
but I have a customized scheme where a multilink
links to all products which are affected by an issue.
Finding all issues of a product would be useful.

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Please forget the whole issue - I figured out that I had
to add a property to isseu.filter before the filter
had any effect in the URL.

It works as expected now. Great!

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re-opening - this is obviosuly a documentation issue.