[Suhiir]

If you alter existing formations the AI will in fact select your new formations during the time period in question...assuming that formation is in the existing pick list.

If you alter the start or end date of those formations the AI may or may not select them during the earlier start date ot later end date period (you'd have to look at the pick list or run experiments to be sure).

The total point cost of your new formations will effect the AI's force selection in that if it's more expensive it'll have less points available for the rest of its forces and if less expensive it'll have more.

Also last time I looked the Russian OOB had mixed mech + tank formations in it already.
However I can't say offhand if these are selectable by the AI or just included for manual selection by players.

This help or add to the confusion?