Anyone think that might cause heating issues? Let's say your battery drops to 30%, you connect your power cover to charge and drop it in your bag. Now it's charging in a closed environment. God help us if it randomly wakes itself (as some have reported) while it's charging in a bag or slip case.
So? Processors are designed to operates under high temperature (100C). The Surface Pro 2 turns off Turbo Boost at 80 degrees Celsius, creating a certain level of throttling system. In addition, Intel processors has the ability to throttle itself down its minimum clock frequencies (750MHz in this case) if it's still hot. That is all assuming you just happen to be running PCMark stressing the system at max, while using Balance or High Performance instead of Power Saver, and on battery, and decided to put the system to sleep while doing this, AND turns on while being in sleep. A very unlikely situation if you ask me, and clearly asking for trouble, and even if you, as mentioned, the system has overheating protection system in place.
If you are not doing this, the device is indeed get warm (assuming it turns on you), but won't even reach 80C. The device will go back to sleep by timeout (assuming it woke up from it while in bag), or you'll arrive at your destination before it happens. I mean you need quiet a hit to have the power button of teh Surface Pro 2 form being pressed, which is unlikely to happen in your bag. And assuming it happens, this must be that the accelerometer of the keyboard got confused (possible), and thinks it's open to enables the keyboard and high pressure is applied on the device (unlikely in your bag) to press a key and have the device wake up, and assume you don't have a idle time of timeout to go back to sleep, you can disable the keyboard and trackpad from waking the device as it is by default on laptops.
So I think you are overreacting a bit.