Unverified. If you want to enable cheats, you have to add the "cheat" command line parameter (note: that's 'cheat' [singular], not 'cheats' [plural]) to a shortcut to the application and you need to add the switch to the target box (and outside the quotes) that enclose the application/target path.

For example: "drive letter:\Program Files\Stardock\TotalGaming\GalCiv2\galciv2.exe" cheat

Ctrl + R Research current tech (Hold Shift for ALL techs).
Ctrl + J Completes social projects.
Ctrl + 0-9 (NOT on num pad) Hail's major races.
Ctrl + C Clones selected ship.
Ctrl + B Adds battleship.
Ctrl + V United planets meeting.
Ctrl + H Heals selected ship.
Ctrl + T Teleports selected ship to cursor.
Ctrl + L Assigns remaining planets to major races.
Ctrl + S Saves.
Ctrl + A Upgrades selected ship.
Ctrl + M Adds 10,000bc.
Ctrl + N Restart on a new map with new race
Ctrl + P Adds 1 to planet class (this adds to the planet size, however you do not get the extra build tiles in the planet screen, so it doesn't help much.
CTRL+U Takes away Fog of War