Aaron has said in another thread to email all suggestions for changes/enhancements to him at
do@malfador.com. He obviously checks this board sometimes, but you can get your ideas to him directly via email.
He's allready heard about the inventory system, I bet, but more wouldn't help. Email away.
About the difficulty, it looks like it'll be super easy to mod monsters, weapons and player stats to make the game much more challenging if you wish.