How can I suggest a feature to the Google Android team?

Put your suggestion at google code.

sorry, 8 years later. At the link below there's a Feedback section with a link to Feature Requests
https://source.android.com/source/community.html

You can easily create a Drawable subclass that draws whatever border you want and reports the padding for that border, and sets it as the background of the view you want to have drawn with a border. Or set it on a FrameLayout to have the border placed around the other views inside of the frame.