A small change that will allow this mod to work with something which is comming soon :eyes:
No noticeable gameplay effects for end users.

Fixed a bug where reward soldiers would have twice the normal AP they would have gotten normally.
Thanks to Tedster for showing me the problem.
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I did leave a config variable to re-enable this behavior ;)

Another fix since I can't into flow control.

Fixed a few incorrect behaviors relate to the "keep as random promotion" config flag.

Added requested feature by DrgLord: now certain classes can be flagged with "First Time Only" setting, which means that they will only appear in the deck in the first time it's build (for "special" classes that should only appear once). Default setting is that this is not used.
If configs are modified with this mid campaign, it will not take effect. Use the console command RewardClassDecks_EnableFirstTimeMode, and then the console command to rebuild the deck.

I would like to thank DrgLord for helping test this functionality.