Is there a way to make the map much bigger? It is still very small on huge.

In ...\Sid Meier's Civilization IV Colonization\Assets\XML\GameInfo\CIV4WorldInfo.xml :
<WorldInfo>
<Type>WORLDSIZE_HUGE</Type>
<Description>TXT_KEY_WORLD_HUGE</Description>
<Help>TXT_KEY_WORLD_HUGE_HELP</Help>
<iDefaultPlayers>12</iDefaultPlayers>
<iDefaultNativePlayers>8</iDefaultNativePlayers>
<iUnitNameModifier>0</iUnitNameModifier>
<iTargetNumCities>6</iTargetNumCities>
<iBuildingClassPrereqModifier>100</iBuildingClassPrereqModifier>
<iGridWidth>38</iGridWidth>
<iGridHeight>60</iGridHeight>
<iTerrainGrainChange>1</iTerrainGrainChange>
<iFeatureGrainChange>1</iFeatureGrainChange>
<iFatherPercent>150</iFatherPercent>
<iAdvancedStartPointsMod>120</iAdvancedStartPointsMod>
</WorldInfo>

Thanks for the info, but I'm hoping to pick someones brain. I'm trying to figure out what the other flags are for:

These couple only seem important if you were trying to add a whole new class (which is probably way beyond me, so I'm just going to modify the settings for one of the predefined word sizes):
<Type>WORLDSIZE_HUGE</Type>
<Description>TXT_KEY_WORLD_HUGE</Description>
<Help>TXT_KEY_WORLD_HUGE_HELP</Help>

<iDefaultPlayers>12</iDefaultPlayers> ---Again straight forward, but I think based on the custom setting that 13 is the max number of players.
<iDefaultNativePlayers>8</iDefaultNativePlayers> ---Assuming this is the starting number of indian nations... 8 seems to assume one of each tribe, correct?
<iUnitNameModifier>0</iUnitNameModifier> ---Not a clue, except that it goes 40, 30, 20, 10, 0 (for the 5 sizes, Tiny to Huge)
<iTargetNumCities>6</iTargetNumCities> ---I'm guessing it's either the number of starting indian cities, or how many cities the European IA tries for (it went from 4, 5, 5, 6, 6)
<iBuildingClassPrereqModifier>100</iBuildingClassPrereqModifier> ---Again, not a clue, except that it goes 0, 25, 50, 75, 100 (Tiny to Huge)... Do I need to up this if I double the map, or is 100 the max?

<iGridWidth>38</iGridWidth> ---Obviously the map width, do you know what the max is?
<iGridHeight>60</iGridHeight> ---Obviously the map height, do you know what the max is?

<iTerrainGrainChange>1</iTerrainGrainChange> <iFeatureGrainChange>1</iFeatureGrainChange> ---Again, not a clue, except that it goes -1, 0, 0, 1, 1 (Tiny to Huge) My main concern is whether I need to change this again for a bigger map.

<iFatherPercent>150</iFatherPercent> ---This one goes 110, 120, 130, 140, 150 (Tiny to Huge). I'm only guessing, but does this mean you need more points for founding fathers on a bigger map?
<iAdvancedStartPointsMod>120</iAdvancedStartPointsMod> ---This one also gets bigger, and seems to indicate some kind of "quick start", but I can't find such an option in the startup menus. Any insight on this one?

Thanks in advance for any help,
GRIZZ :)