The great thing about the A4 (A-series) paper dimension is that the dimensions stay the same as you scale up or down. I would very much appreciate an option where I can fold open a portrait A4 to a Landscape A3, and then to a portrait A2. This way I can scale up or down frames but hold on to their dimensions. Right now I'm doing all this by hand by creating a new A4 frame next to the original, turning it 90 degrees and matching the dimensions of the short and long sides with shift pressed.

It would be even better if I can choose to set a fixed/real size of A4. Miro holds on to the true size of pictures that I paste and stickies have a fixed size too, so why not A4?

In the picture below the Frame 2/A3 is seen as a ‘custom ratio’, but Frame 3/A2 is recognized as “A4”. 

The way it is implemented now, with variable sized “A4” does not make any sense to me. It's like calling a square frame a square meter/inch/foot frame, changing the size of that and still call it the same. A4-series has a fixed size where A0 has the surface area of 1m2, A1 is half of that and so forth.