I just now refreshed the
SOSLIB repository so the new utility (SOSFUNCIDX, run from the SOSFUNC: directory) is there.
Note that it requires certain formatting standards for the module/function headers, so as part of the refresh, a dozen or more of the SOSFUNC: BSI files were updated, but mostly just cosmetically.
The utility could probably use considerably more work, but I've found it to be useful as-is, although you definitely want to add OPTIONS=XTAUTOFILTER to your miame.ini so that you can use the pattern search to look for keywords.
(I didn't explicitly set the XTF2_AUTOFILTER flag in the SOSFUNCIDX.BP module, probably to make it somewhat more backward compatible; so to get the feature you either need enable it globally in the miame.ini, or modify SOSFUNCIDX.BP.)