As far as I know there is no complete list of effects, if you look through the traits and ancillaries files you will be able to generate a list of all the effects that CA used in their release.
You can't make create new conditions (such as checking if a player has a particular ancillary) or new effects (such as MissleCommand which would be similar to InfantryCommand or Calvalry Command)
EDIT: The file I suggested you find earlier in this thread will have a list of conditions as well as events that can be used.
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