AbleCommerce Shopping Cart Software

If you have a group of variants that have different pricing there seems to be no way to set a set price for a customer. For instance say I have..

red shirt $5
blue shirt $6
green shirt $2

But for a certain customer I want to sell any color to him at $2 each.. I see no way to do this.

For volume discounts you can do a fixed amount off or a percent off.. why not have a option to just set a price instead of a amount off?

Another option is to create a discount coupon and automatically apply coupon code on checkout for this particular customer only. You can also implement a separate database table with specific
product prices per customer something like (CustomerId, ProductId, CustomPrice) and use the custom price if a custom price entry exist otherwise use regular item price.