I don't think the Tinkyada brown rice pastas are bad. Some of the white rice ones are gruesome.
I make my own flour mix with rice, potato, tapioca, coconut and sometimes GF oat flours. With the xanthum gum, I can use my regular recipes. I'll have to look for the garfava flour. Bob's Mill white cake mix is good. I haven't tried the shortbread cookie one yet but it's in the cupboard.
An apple coffee cake made with GF Bisquik was excellent. I think you could make biscuits with it by adding a butter/shortening mix and cutting it in like real biscuits. I'd add some vinegar to help them raise.
I can't have corn or yeast either, so I haven't played with regular bread.