@Mercurio
the in-game resolutuion (just below the PiP field and to the right of 'enable maximizer') tells the wow originally associated with the region, what resolution to render in. wow then goes about rendering as if it will display to those dimensions.

if you want to insure the aspect ratio of your regions is correct, thereby making the minimap a circle and not a football or egg, then you want to keep the dimensions of the region (on the top right) to be some scaled ratio of the in-game resolution.

also, when you swap around, if the dimensions you swap to are not the same, wow could (i have no knowledge of their actual code) re-render the surfaces as the wow gets repositions/resized. so, the best idea would be to keep the large region (which you are swapping to) the same ratio as the smaller regions. this way, its just like a simple resize for wow and (hopefully) no re-render should be required.

there are numerous example layouts on the main site (link )