I'm pretty sure we've all taken a typing/computer class at some point.
Now, in said class, we were taught to use the home row. I quite understand that not all of us stick to that in our typing styles.
However, I do believe that based solely on ease of use, the right side shift key would be used when capitalizing letters located under the fingers of the left hand.
My disbelief is that you are not mong enough to use your left hand to type an a while using the same hand to hold the left side shift key.
If you are to be believed, then I apologize for having overestimated your evolution level, you godforsaken mong.