I am going to take some time to bring to light some usability issues from the perspective of a person responsible for editing content on a DNN site.  First up is Image Properties Editor:

Using the RadEditor,  right-click on an image and go to properties to adjust the size of the image.  In the properties sheet you see Width and Height and a lock aspect ratio button.  By default the lock aspect ratio link is set to unlocked. A typical person tends to adjust the width and height ignoring the lock aspect ratio button and the end result is an image on a page that is skewed. Or if the person is aware of their mistake, they will click the button after they already adjusted either the width or height and they now have lost their aspect ratio and they have to fidget to get it back again. 

Suggestion:  Make aspect ratio locked by default.  I have yet to be in a situation where I do not want my images to have locked aspect ratios.