Another YAY from another drop shipper!

Any hints of how close is this mod to be ported?

When I first tried oscommerce I tried adding the mod - but I ended up breaking it. I thought it was a very clever idea and I was looking forward to it.
In the mean time I discovered Zencart and... I don't want to return to oscommerce ever!

But this nifty mod would be fantastic if it will be working in zencart!!! We really do not need anything else at that point!

G