It would be cool it they had a magnetic attachment on the pen that can click on to the power adapter or created an area for it anywhere else.
Yeah, the lack of a silo has always bothered me. It's not like the current size is perfect and anything large enough to hold the pen wouldn't sell.
Thing is the pen is thicker than the Surface isn't it? So where's it going to go lol... I certainly wouldn't give up any thinness for that!