For the AI to use a formation such as the quincunx on a consistent basis such as everytime a human player encounters an AI controlled Roman force. Would require the AI to have recruited in campaign the prerequisite units for this formation as defined by the AI formation file itself. No formation mod would fix this. As it's a recruitment issue or lack thereof as it is relative to the code of the actual formation itself.
I've always found it easier to keep formation integrity by grouping individual battle lines within the overall formation itself....ie...1st grouping would be the first line of Hastati..2nd grouping would be 2nd line of Hastati..3rd Principes..4th Triarii...etc...in this manner I've never really had a problem with keeping formation integrity as opposed to the scenario described by the OP. Perhaps some would consider that too much micromanagement of a battle but that's how I like to fight just the same.
On a side note...mcantu recommended Marcus Camillus Player Formations for the Roman Player. These are very good provided you have the right unit mixture. Along those lines, although little known it seems, Sinuhet made custom Human Player Formations geared specifically towards the Roman Player that are excellent as well. I should probably add them to the formations mod download in the unofficial mod forum when I have a chance. Anyhow, here's the link to the file over at TWC. If your a Roman Player, I'm fairly certain you will find them to be pretty good. Again, for the formation to look exactly as it is intended by the code. The proper unit mixture needs to be adhered to.
http://www.twcenter.net/forums/attac...7&d=1141660319
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