Need some suggestions

I'm working on a full screen inventory system for a single-play campaign and I'm trying to make it as user friendly as possible. And so I am here, asking people what they would want in a full screen inventory.

Some questions of mine.

How would you want merchants to work? Show the inventory and the merchant inventory or make them generic WarCraft 3 merchants?

Would you like to sell items at the same time you buy them (would require a merchant/your inventory on at the same time).

Any other suggestions you have that you would love to see in an inventory system?

All suggestions will be taken into consideration, and if they become popular, will be implemented.

A few features already: 6 consumable-item slots (uses the normal inventory of heros); Equipped item-slots will be in the shape of a body. I'm working on item descriptions and what-not, but they should be included.

Thanks for all the suggestions!

Game cahce compatilibility

-Av3n

Some weapon quick change slots would be nice, let you cycle between a couple of weapons without opening the whole inventory. Maybe using the arrow keys.

Just a random thought.

The system will be able to store and load on another map.

BBDino, I like the idea but I wouldn't use arrow keys... I use them quite a bit for scrolling the map. Maybe I'll make it an ability that toggles between 2 slots.