Thanks for the tips. Being a Mac guy doesn't really help when I'm looking for obscure tools. haha
Anyway, I found the thing I was looking for... and that is Bob Rost's toolset "nesmus" in conjunction with nesasm. http://bobrost.com/nes/resources.php It's not the prettiest way to make things happen, but it makes a lot of sense to me.
Just wanted to share it.