A very accomplished bread baker gave me a wonderful tip to enhance the flavor: before you bake your loaf, take 1/2cup of the dough and mix it with water/flour to make a 'slurry' on the thick side. Let it stand out , mixing it down when it rises high until it gets a kind of sourdough smell to it. That achieved, keep it covered in the fridge and add it to your next dough. I am on my 3rd loaf using this and it does enhance the flavor a good deal...not quite a sourdough flavor but yummy.
Per her suggestion, I roasted sunflower and pumpkin seeds and then put them thru a grinder to make a coarse powder. I add this power to my dough...about 1/4 of a cup. Yummy!