I'd love to see the following features included in virtuemart...
1) A selection of basic themes - Nothing too elaborate, just some basic styling for the shop. Searching for compatible designes is a real pain in the hoop, especially as we're reliant on developers to update their themes as and when Virtuemart is updated.
2) Product promotion. Eg buy one get one free, free product on basket price, discounts etc etc.
3) Integrated creditcard paypal payments pro...
4) True one page checkout, everything on one page, no popup boxes or nav out to input shipment /payment/ billing details etc.