First off, love the software. It's now one of my top two most used tools.
So, quick suggestion. I think it would be super helpful to have an object details panel apear when you click on the object in the design view. I encision it to be similar to what you see under the chrome:developer-tools>Elements>Computed
Something simple that shows the position,margin,border,padding & size of the object in numerical form. This is super helpful when working with sizing your objects correctly. Currently I have to keep switching back to the dev-tools tab to look up object dimensions.
Also, as a bonus, it would be cool to have something similar to the computed-style-list it would make tracking down those pesky style conflicts a whole lot easier (especially when using elements you get from the web :D)
I know not everyone would benifit from this, but perhaps it can be an optional side panel that you can choose to include...
(included screenshot of what i'm talking about)