Not sure if this will help you much but here is an image showing my current MRAA GPIO cheat sheet:
I actually have it as an Excel document which I will probably upload to some project up on github. I also have not verified and tried everything here yet. For example I have not done anything yet with PWM... Mostly the colors just help me find some pins that are used for some function like I2C or SPI. On SPI I only highlighted the ones that I use with the wire library. Should probably highlight the other set as MRAA can also work with those.