Yea, Articles Extra has got something going on there. Its tags really belong to a TV, don't they, articlestags? Being such, I'm sure you could build your own tag system the semi native way, using taglister tolinks and so forth. You'll probably have a better chance of grouping your tags more accurately, or should I say, more to your desire.
Taglister is not my forte, I am just throwing out the idea for you to carry. I am 230% sure it is possible and easier than it portends. Well, this is MODx, right?
First, this is how I would mix up my blog entries in a category, Sonnets,
drawn from several Articles Containers. You could even build several landing pages (a bit cumbersome), each pointing to a Category. Have a link to that category and a count of the resources in brackets.
Sonnets (34). This would be a run-around-away of doing it. I think it is easy to count resources.....I don't have a code for it here. In all though, you'd have complete control.
<ul>[[getResources?
&context=`web`
&parents=`239,259,73`
&showHidden=`1`
&tpl=`ArticleCategoryTpl`
&sortdir=`DESC`
&sortby=`publishedon`
&includeContent=`1`
&includeTVs=`1`
&processTVs=`1`
&tvPrefix=``
&tvFilters=`articlestags==Sonnets` ]] //if an article has multiple tags, this won't work!
// even if Sonnets is one of them. Perhaps there is a solution
</ul>
Secondly, build thy own tag system? If you understand (good luck) the documentation on Tags please educate and enlighten me/us.
The good thing is, it does the counting for you, prepares the landing page for each category and so forth. Just clean up the URL that's all,
[[!tagLister? &tv=`articlestags` &target=`34`]]