There is a hak on the vault that uses a map inventory item to trigger the display of a 2d map TGA as a placeable for a certain duration. I was playing with this a bit with the map I was drawing a while back, but, I haven't worked on the map much lately.
The way it gets displayed is kinda funky and unnatural looking, but its the only way I've seen thus far to have IG maps.
Heres the link to the hak if anyones interested:
http://nwvault.ign.com/View.php?view=Hakpaks.Detail&id=719Edit: Acctually, there was another way to have IG maps that I though up a while ago but its not the most idea method. It involved several large custom inventory icons (3 2x3's in a row for example.) Each icon was a portion of the map and when put together they displayed the map seamlessly. They came with a "Map folder" (a container with the letter 2x2 icon or something) so they didnt take up your entire inventory. They could be used for regional maps, city maps, or, even more fun, treasure maps, since they could be split into fragments.