Great news!
I think that ultimate solution would be for user to be able to select and dedicate one layer for this plugin.
Where he make his 3D world.
And that he can set underneath and above some layers that might be used for lets say... paralaxed background (if wanted so) or nav mesh perhaps and for GUI elements.
have a look at this example:
https://dl.dropbox.com/u/148996943/top3 ... ed%29.capx
This would be a 3D top/down world example for RPG, RTS etc.
And since i cant find proper sample let us use our imagination and look at this same exmaple but as a platformer.
so that green gras is actualy horizon and houses are boxes on wich player can jump etc.
This would be 2 world examples that shoud be like preset to chose from regarding on game that were building (and physics is oriented acordingly).
so 3 presets:
1: top/down (if i use this preset... i just drag/drop obj. into layout and it is oriented in that manner that its top is facing me)... (i see the roof of building)
2: platformer (if i use this preset... i just drag/drop obj. into layout and it is oriented in that manner that its top is facing up)... (i see the side of building)
and maybe
3: FPS/drive sim. (like your demo tanks where i can roam free)
Hope im not tooo complicated? <img src="{SMILIES_PATH}/icon_e_wink.gif" alt=";)" title="Wink">
Cheers!