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I received quite a few helpful tips on making the pumpkin roll:

Some people have had good luck with sustituting with 3/4 cups of Betty
Hagmans flour mix and adding 3/4 teas of xantham gum

one person substituted with guar gum and also substituted the oil with
applesauce and doubled the egg whites for the eggs and whipped the eggs til
they were still and then added the sugar, said it turned out great.

another said  she  substituted with 1/3 cup soy flour for some of the rice
flour, said it works wonders

another said to make sure you don't overcook it and roll it when its hot and
make sure the filling is cold

another said to substitute corn starch and line pan with parchment  or waxed
paper and spray with a non stick spray for ease in removal. Also let rest for
5 minutes and turn upside down on a towel sprinkled with powdered sugar

another sliced cake and stacked up with filling in between layers.

Thanks for all your tips, can't wait to get started!