As said earlier, I wouldn't mind a volume measuring system, but it would be very hard to implement, as it's not only a question of volume unities, as the shape of the objects should be considered at least to some extent.
I think that it would be pushing it too far.
In my opinion, the best inventory system that we could have is something ala Diablo+TES (it has slots, but like in Diablo and not WoW, for example, but also you need to be strong enough to carry all that stuff).
This is system would be pretty real in my opinion, while still not pushing it too far with too many complications and stuff.
Stuff like keys would go on a keyring and would be in separate mini-menu (like gold).
You're welcome. :turned:
Also, it would be cool if we have 'Other' option in the poll.
Edit:
We should also be able to drop gold on the ground.
I personally loved to decorate my alchemy room with gold coins and stuff.
It look as if I'm studying gold in order to figure out how to turn iron into gold. ^_^