Deprived, not sure if you answered this already, but have you looked into automating the transfer of PURCHASE to MINING+SELLING shares?
I did have a quick look around a few days back but couldn't find any Oauth 2 libraries I could use to do it quickly, so as I'll likely have to learn some new language to do it it'll have to wait until I've finished what I'm currently working in.
You should be able to do it pretty easily with Python using urllib2 and google's oauth2 library. If you don't know python yet, it is one of the easier languages to learn and very expressive / powerful.
I don't know python but it did seem to be the one I was likely to end up using. I'll probably sling up a bounty for someone else to do it - then amend whatever they produce to add in the extra functionality I'll want later.
Had hoped to find a C++ library for it but doesn't seem to be a decent one around. The issue isn't so much learning another language as learning all the different libraries for things like building a GUI, interfacing with a database etc.