I just saw this hahahah...I just burned a big hole in my Diamond star quilt the other day and I didn't even do it on purpose. Of course the dryer sheet will burn and so will your quilting fabric or anything else you strike a match to hahahhahaha
I have used dyer sheets for ages and love them for my crazy blocks etc.
I usually buy the cheapest dryer sheets I can find and they don't have a lot of smell or stuff on them and when hubby gives them to me they are soft devoid of anything. I love using them and will continue.
I also use them for applique. I spray starch heavy, then I sew all around the design, cut a slit in the middle of the sheet and turn right side and starch and press again. It appliques beautifully, just as if you are using the expensive stuff....I don't spend if I don't have to and I like to recycle..
Having said all that, it is always a good idea to check everything out and make sure.