Events and Marketpress - pay with multiple products


I have everything working great with Events and Marketpress except these key items:

1. Is there a way of giving users the option of choosing amongst multiple product items instead of just one when paying for an event? We would like to give each user the option of buying many items from a selection our menu.

I put all products under one Top level parent product category. I then chose the same top level product category under the Events -Settings - Payments via Marketpress ...

2. Once an item is chosen as a payment option for an event --- it is removed from the list of item options when creating future events.