Being able to copy/paste frames and content from one master page to another, especially L to R.
Maybe a L=R button or tick?
Copy and paste of text to retain formatting. At the moment copy/paste strips font etc. from the pasted version.
Some method of locking to line elements up. The little squares don’t help with this as you can’t line up the actual frame edges by eye.
Could it be that when you click on a little square (on a frame) it shows the values, without having to move it (and thus change the values)?
Also, the values when altering frames seem to jump (i.e. 30.1 to 30.3) and zooming out wildly doesn’t (always) help. At the moment this means that my L and R pages differ in various places by 0.1.