All Civs start with all technologies:

Difficult, you need to mod the raceConfig.xml and add all technologies to the Races (you can't add all techs, like the tech victory and cultural victory would came at the same time for every player I guess the game will crash)

just add more techs to the races in the RaceConfig.xml.

Massive Fleet size:

simply increase the logistic value in the raceconfig.xml file to 100 or so.

Which civs are present:

You can choose that at the beginning of each sandbox game (singleplayer without campaign)

Civs start with more than one planet:

Mod the customplanets.xml

in there you can see all homesystems of each race in game.

there you can mod how the planets look like and how their planet quality is =o)



Modding the xml files is very easy, take a look at them and try to understand what the parameters change, then try modding the values.

all xml files are in the Data/english folder!


hope this helps,

sincerly,

Stefan