MarketPress: Custom Slugs & CustomPress

Two problems...

1. When I attempt to customize the store URL structure ("store" to "available" and "products" to "list") I get 404'ed when I try to view a single product. Very peculiar behavior and the only way I can get it to stop 404'ing is if I revert it back to the default slugs. This of course defeats the purpose of having this option in the settings.

2. Their are no clear, precise instructions on how to use CustomPress with MarketPress. I've spent over an hour trying to piece together forum posts and still come up blank. I was successful getting the custom fields into CustomPress and thus the administration in the product section, but not the front end. Documentation needs much improved for this plugin to compete with other WP eCommerce plugins available.