Sorry I didn't get back to you right away (not having my own internet right now sucks). But here is some additional info that will help you out with locations/maps.
Locations use the location pointer AND a map file. The location pointer uses the scroll data to define the playable area in that location. Whereas the map file is the entire map itself and can hold multiple locations(that's obviously where scrolls come in handy).
Also, you can change the locations map file to CA for a blank map. (Maps CA-FF are unused, but CB-FF won't be use-able until the next version of Temporal Flux)
The map part is highlighted in yellow for you in the screenshot below in part "1". Also, change the change the palette(highlighted light-blue) and L1/2 & L3 Tilesets(highlighted green) to whichever one you want. I chose the Zeal tileset and palette because I am making a Grand Library for Zeal Palace. (Zeal Palace seemed empty so I figured I would make this area; filled to the brim with Zealean knowledge and secret passageways).
If you look at part "2" this shows you how to make the Map Properties tab visible shown in part "3"
Window_Menu>Location>Map Properties
..and "3" is located at the very bottom left corner of the editor(by the Start bar if the window is maximized).
Clicking on the tab will overlay the Map Properties editor over the Location Properties editor.
Part "4" is part of an image of the Map Properties editor. Here you can change how many units a map file uses(simular to the scroll editor ChickenLump is talking about but used instead for tile space that the entire map uses). The max width & height is 40 (which is quite alot of space).
(Don't you just love my Fisher Price images? Now even toddlers can learn TF!)
I hope this helps.
Oh yeah, and if anyone is curious to see my progress just click on the image:
The bookshelves can be walked behind (I changed the Priority of the NW,NE,SW,SE Tile Quadrants for the upper tiles on them to False).