Very interesting thread, guys.
In the Paeninsula Italica mod (I work on the EDU) I'm using this very simple model : 0.4 - (MORALE/100)
So the Spartiatai, for example, will have a radius of : 0.4 - 0.17 = 0.23 that is very close to the optimum. Less drilled units will have a looser formation, and levy hoplites will fight in a manner only slightly more tight than non-hoplites units.
I suggest give this feature to all units that have the first value in the formation line inferior than 1.
About the discussion about Iphikratous, IMHO the decision of the EB team is senseless. The fast cavalry catchers are:
1. for old style hoplites, the Ekdromoi.
2. for reformed hoplites, the Thureophoroi.
The only point in the existence of such a unit as Iphikratous hoplitai is to portrait the advantage of new hoplites in spear lenght, and the only way to achieve this is through the phalanx formation. Again, IMHO.
Cheers
EDIT: I don't remember if already posted, anyway, original discussion here http://www.twcenter.net/forums/showthread.php?t=188651
Bookmarks