you would have to go into every entity file and alter the buildtime line.
good luck!
That's just painful, and not necessary.
In order to mod, you'll need to download the game packs from the downloads section. That will provide the game in raw text to work with. From there, go into the GameInfo\
gameplay.constants file. Do you know how you can change the global game settings from slow/fast poor/rich? This file states how strong each of those settings are. Scroll all the way down near the bottom, you'll see these lines:
buildSpeedData-Slow
shipBuildRateGameSpeedScalar 0.0
moduleBuildRateGameSpeedScalar 0.0
buildSpeedData-Normal
shipBuildRateGameSpeedScalar 0.10
moduleBuildRateGameSpeedScalar 0.10
...
.....
....
shipPhysicsSpeedData-Fast
shipLinearMaxSpeedGameSpeedScalar 0.6
shipLinearAccelerationGameSpeedScalar 0.6
shipLinearDecelerationGameSpeedScalar 0.6
Tweak them to your heart's content. When you're done you need to put all the gameinfo files in a new folder, and put them in your mods directory. You can check in game (under options/mods) to find where the mods directory is located.