Yes rubberduckproductions, that is the only down side to an Auctiva store front, shame really, it can look really good but without this piece of functionality it is of very little use to sellers like you and very limited for me.
I have asked before and had very little response on the issue apart from the section of code that would require changing is deep in the overall application. This gives me the impression that the code is not modular enough which means a lot of work to make a small functional change which could break the 'store' application itself. Ho-hum.