Hi Mike,
The answer to each of these is no.
WebStore is in early stages of development, primarily driven by my own needs to sell secure download files. It will eventually evolve into a more general purpose ecommerce solution, but it has a long way to go and isn't going to get there in a hurry.
One could export any data using the tools of the database platform like SQL Server Management Studio but there is nothing built in to mojoPortal at the moment to export users.
Best,
Joe