Instead of old-fashioned whole oats, I would prefer quick-cooking or steel-cut oats. This may affect the texture of the dough, however, so don't dump it all in at once. Add the flour, ground nuts and oats alternating a few spoons at a time until you have the consistency you want.
The same principle applies if you use a higher-fiber nut like ground almonds instead of pecans.
Instead of old-fashioned whole oats, I would prefer quick-cooking or steel-cut oats. This may affect the texture of the dough, however, so don't dump it all in at once. Add the flour, ground nuts and oats alternating a few spoons at a time until you have the consistency you want.
The same principle applies if you use a higher-fiber nut like ground almonds instead of pecans.