Admin Dashboard customization for the users on a network (especially MarketPress)

Hi!

Well, the title says it all. I want my users to see an admin dashboard customized by me when they access their site (store, in this case). I want something as simple and straighforward as possibe. The user must be able to log into the account and see only what he/she needs to create the store -a button to upload images of the products, another to choose the payment methods he/she is going to offer, etc..

I've heard about that plugin you guys have, Ultimate Branding, but the thing is: it only offers a really generic customization; I want to know if there's something I can do to achieve what I need for the MarketPress case specifically.

Thanks!