How do you make an expanded map on transformice?

if you press the spacebar, you can drag the map in map editor to make things out of screen

to make a scroll map you input this code:

<C><P F="4" L="1600"/><Z><S /><D /><O /></Z></C>

in the save/load part of map editor

you can make the scroll map bigger by changing the number next to L= and putting any number within the quotes