We decided to use child forums instead of topics for this purpose which solved the issue described above but created another, see new thread.
There’s bbP last post, bbP private groups, bbP Quote, bbP shortcodes as well as bbp style pack.
Thanks for that. But this is quite confusing, the form I used was copied from dashboard>settings>shortcodes>additional shortcodes
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Shortcode actually used: [bbp-display-topic-index show=’15’ forum =’283,285,515,523,1159,21099′]
OK so I found the shortcode [bbp-display-topic-index show=’5′ forum =’10,11,12′] which should have done what we want if we’d specified all forums except the one we want excluded.
However, this doesn’t seem to work properly, only two of the six forums specified have topics displayed despite all six being represented in the default view (15 topics, using [bbp-topic-index]).