I've thought about it some more, and I probably shouldn't be so upset about some grammaticians' well-meaning attempts two centuries ago. I mean, now it's a part of the history of the English language, and it would be pretty hard to see adverbs and adjectives as interchangeable... Although about that -s ending for stores I'm not so sure. I mean, to the inhabitants of a certain region it comes naturally, so I suppose it's part of the dialect. Although the fact that they themselves struggle with explaining it... well, I guess it's just fascinating. The practice is probably bound to die out sooner or later, if our world keeps getting more and more interconnected.