It would make a lot more sense to me if transaction history showed the price you bought or sold BitUSD/BTSX for by using the same inputs you used when you initiated the trade. Currently, it expresses the values backwards so if I sell BitUSD at X amount of BTSX per unit it will read something like "pay bid @ 0.04 USD / BTSX" in the transaction history.
That's all well and good except if I don't write down the sales price it's very tricky to figure out what I actually sold it for. The transaction history should have at least one line that matches my inputs and the information it's currently showing should be something like "details" I can see if I open up that transaction, is what I'm asserting.
edit: this would also have the added effect of cleaning up what the transaction history looks like. So instead of showing all the bits and pieces of a transaction separately you have a single, time stamped, line item which clearly matches the info I inputted to make the sale. The details of which should only be seen if I expand that transaction. I think you'll find users will have a much more pleasant experience if you do this.