Powerstore in the UK
With the first release of powerstore, I got quite excited thinking I was on easy street, but that was short lived when I found out that the store is built for the US market. It was purely geared up to take payments through the US PayPal portal... so, that was no good to me.
With the second release of power store I looked through all documentation only to find that the only supported currency is the US dollar again!!
Surely you have enough non-US customers to implement a process of being able to allow a store to take payments in the UK or France or wherever a payment needs to be taken. Could it not be done with a simple cut down extension based on e-cart? You don't need to be able to build a cart from scratch with the extension, but just allow a user to input their payment gateway details, username/password, etc. If it can't be done with an extension, then it could be done with an include file at least.
There is obviously some ability to personalise the store as the store must be able to send an order confirmation to both customer and store owner, so why stop there?