This is more like a suggestion than a question.
As I understand, it’s a choice of the developers not to allow us to resize the equations via edge click-and-drag, right? Instead, they want us to open the equation editor and change the font size there.
This makes some sense when one think about consistency, so it is easy to keep all equations with the same font size. However, in practice it is quite annoying. Specially when you are still trying to decide which font size to use for the equations.
So I would like suggest that the font size of the equations should be controlled by the font menu of the main application, and by the font size bar. No need to open equation editor for this!
Also, official Latex support would be awesome!