[Plugin: eShop] Stock Options

Is there any way to add different stock values for different items? For example, I have 3 red socks, 4 blue socks and 6 black socks, however right now I have to write down my stock as 13. However if someone tries to order 13 black socks, I clearly do not have the inventory to fulfill that order.

Is there a way to do this? Or can the developer consider it the next patch?

http://wordpress.org/extend/plugins/eshop/