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The megaregion is interesting if you use vehicles (sit on ; car, boat, etc); they can to cross regions.
Me i prefer the classic region ; you can fly from a region to an other, or teleport too ; but you can not use vehicles (sit on).
You can to change megaregion to classic region. I've made a tutorial on my NWG region (named Communaute - E et P)
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Warning:
Before to change this, you have to put ALL objects of ALL region into your inventory !!! If not, you will have the BUG of objects (not possible to delete).
With 1.4 version of Imprudence viewer, you can select many not linked ojects and put into your inventory in one time. They appear into it same an an alone object. When you put out of your inventory, the position between the root selected and others will have been saved.
The web link of it is :
http://blog.kokuaviewer.org/2011/09/25/imprudence-1-4-0-beta-2-released/