Marketpress - how to approve products before they get published

I'm probably (hopefully not) in for some customization with this...

Would there be a way to control or give the final approval of products in stores before they get published?

I have created a global marketplace which is awesome, but as people are learning they are publishing products that are not in place yet etc. I can see this getting frustrating for the end user and really messy.

Would there be an easy way (hopefully not major customization) to control what gets added to the market place or not?

Thanks,

George