I love the ability for us to make our sites responsive on mobile, but the cherry on top would be to have the ability to choose different media queries to then make sure our site is responsive in any device.

At least, add a tablet view to make sure our sites look great on tablets. My sites do not look good on tablet and that is very inconvenient for my clients since a lot of people use their iPads during in-person 1 on 1's. This would mean the world!