1) Hardcore - Something like writing a will in advance, that would allow you to pass on 1 item slot if you die to someone on your friend list
AMAZING IDEA! Or better yet, pass it on to another of your own characters! Or, if you die, it spawns a dead solider in the same zone on other characters, and when you click it, it gives you one of the items you had on at random!
But, my idea is I would really like to see the crafting system improved. The Hellfire ring was a huge step in the right direction, but I want to see 1 time use recipes drop that give you really good stats. Or Base recipes that you can use whenever you want, but the ability to add 1 time use recipes to that base recipe which garentee certain affixes. So, you would select an axe in the list, the UI would have the axe on top, then 6 empty boxes below it. you can then drop and drop 1 time use recipes into those boxes to add attack speed, or crit chance, or crit damage. That sort of thing. The 1 time use recipes would be legendary drops. Then, of course, the less desirable affixes, like health globes, or thorns, would be purchasable through a vendor.
Also, please bring back charms!