restricting access to marketpress

I am busy implementing Marketpress on a client's site and he would like to have a dedicated login for a shop assistent to update/add new products and change stuff.

I had a look at roles and capabilities and it seems Marketpress doesn't add any or am I missing them?

So basically I'd like a particular user to only have access to the Marketpress menu to add / remove / edit products but not to the base settings like currency, shipping etc.

Is there any way to do this right now?

If not, are you planning on adding some capabilities into your plugin anytime soon?