Well, I have tried out the corn flour. I don't have any sprinkler type container, so I couldn't apply it properly. Nor do I have a big poof thingy which I remember my grandmother had when I was a child.
Also, I haven't used talc since I was a child experimenting with my grandmother's cosmetics, so can't really remember what it's supposed to feel like.
Having said all that, I didn't notice any feeling or over dryness/roughness, it felt silky smooth. However, given my lack of anything to compare it to, why don't you try some yourself Jon? More than likely there's some in your kitchen cupboard; if not you can get a box for about 1.75 - if you like it it'll last quite a while. If you don't like it, at least you have something to thicken your sauces with.