Software Licencing for MarketPress

I have started building a store for premium themes and plugins and I wanted to provide automatic updates for those products, just like you guys do!
I came across this article: and it got me thinking.
Right now MarketPress can be used for downloading digital products but it would be one hell of an addition to provide this as well!
I realize that MarketPress is not suitable for everything we might ever want, but why shouldn't it be? :stuck_out_tongue: Even as an extra plugin this would be reaaally cool!

I ended up using the digital downloads plugin and the software licencing addon, but it would be nice to have it combined with MarketPress.