hello,
i am thoroughly enjoying the game, though i can think of some improvements :)
(in any particular order)

• a search option in the passive tree
• making left mouse button force run
• a health bar for summons (and buff them ;-) )
• a toggle for the items highlight on the floor
• in multiplayer, when you drop an item from your inventory, make it available to other players (better than having to trade every time)
• maybe a point-by-point respec in passive tree
• a button you can press to see the item when its on the ground, so you can decide wether or not to pick it up.

That's what i come up with for now...
feel free to add :)