> identifying the largest (or smallest) changecount
> value for the tiddlers within each category and then perhaps appending
> the value to the end of the category

Try this:
---------------
<<forEachTiddler
     script '
         function getActivity(category) {
             var tiddlers = store.getTaggedTiddlers(category);
             var changecounts = tiddlers.map(function(itm, i, arr) {
                 var c = itm.fields.changecount;
                 console.log(c ? parseInt(c, 10) : 0, itm);
                 return c ? parseInt(c, 10) : 0;
             });
             return Math.max.apply(Math, changecounts);
         }
     '
     write 'tiddler.title + " (" + getActivity(tiddler.title) + ")\n"'
 >>
---------------

HTH.


-- F.

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