First of all you have to have the expansion pack "the conqurors" to be able to edit the populatin limit in the editor, if you do not have The conquerors then you cannot edit the population limit in the editor.
The reveal map commands do not work in the editor, again you have to have the expansion pack to be able to make something like that happening, but then only with "maprevealers" which would be kind of a huge task to perform on the whole map, and if you only want the map to be explored then you have to remove the "maprevealers" with triggers in the start of the game also.