@martin
You can already do that.
You can just disable the forum and all topics would be automatically disabled as well.
If you really need just to disable one topic you can already do that as well.
In "Topics editor" -> "Post limit" -> enter the same value which you see show as "Total posts sent" (on the right) -> press "Update" button.
Make sure to enter in "Post limit" field (not "Daily post limit", that's totally different field).
It will just skip that topic always when posting now (it's disabled).
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