When you create a map with the mod installed, the mod 

will create a "mod_PortalGun_world.properties" file in 

the World save folder.



If you plan on releasing your map with specific rules,

(eg: gridMode 2, throughGlass 1, hepMode 2)

Change world override in the properties file to 1, and

set whichever settings you want.



You can post your maps here:

http://www.minecraftforum.net/viewtopic.php?f=1034&t=237581