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Adster, as you probably already know, no one flour makes a good substitute for wheat flour. Mixes are best if you are trying to substitute for wheat flour. The
gluten-free homemaker discusses different gluten-free flours and mixes. I've had good luck with her GF french bread. I also use her GF flour mix in muffins with fair success. Sorghum is a large part of her mix. I've had no trouble with it.
If you're trying to make breads, you'll want to put together a mix of grain flours, starches, and gum/gelling agents. At my house we sometimes use the Arrowhead Mills GF flour mix. It contains bean flour, which is good for added protein, but the flavor is not great, imo. The Arrowhead Mills brand seems to have the least beany flavor of any commercial mix we've found so far.
For replacing flour as a thickener, I use starches -- cornstarch or potato starch.