Marketpress pricing, manual payments and global products listings on a multisite

Hi I have three questions if anyone can help.

1. Is there a way of accepting manual payments or allowing credit terms for say business customers on Marketpress?

2. Is there a way of having different pricing for different users? Meaning that a price for a specific product shows up differently depending on the person logged in.

3. Can global products on a multisite have a shortcode similar to single products? As in to take a product from one site and list it singularly on another.

Thanks in advance.