Oh, I didn't know about that feature. But still, I'd prefer a fully-featured sales window because:
- Sales window remembers your sales. Only a single click is needed to sell everything. R-clicking on the other hand needs a lot of clicks and brain power since you need to remember/check whether you sold a certain item in the past or not.
- With sales window, it's easier to pick out any items you haven't seen before
- With sales window, you can see additional info such as sales price or weight, which might be important for deciding on a sale