Good suggestion, and I’m sure it is possible (PR welcome!).
I address that by simply tagging posts with #wiki in my instances. It is of course semi-manual - you can identify the wiki posts / topics by advanced search. It has the added bonus of making them easily discoverable via the sidebar navigation.
I thought that it would be nice to have auto-tagging of wiki posts as part of this component some way (or do as you suggest) but it hasn’t caused me enough pain to put in the time to give this a crack I’m afraid.