Yeah I've already planned this out, just haven't implemented it. For one it's not nearly as useful a feature in Cogmind as it is in something like DCSS, because in the latter you can do a lot of backtracking just fine, but if you backtrack much in Cogmind, depending on your build you could be in for some serious trouble.
Actually it's slightly different but we do already have another thread for
item filtering, which has been partially implemented and you can control it via settings in advanced.cfg (just nothing by type yet).
That said, now that you bring it up maybe I could add a search-based filter feature first, which'd be easier than the one I have planned... I've added some new ideas to the list