Lastly, I really don't like this fix mainly because it strengthens units that -should- be weak, namely spear milita and town milita. Spear milita should die like flys from Enfilade/rear fire, because Spear Milita are just peasants with spears.
Spear militia are currently too weak. They get dashed aside by cavalry as though they aren't there. They definitely need boosting, though more in their ability to stand against cav charges, not necessarily in their ability to absorb arrows from the rear.

A schiltron though, would be a fairly effective anti-archer formation in that suddenly, there isn't an exposed flank/rear to shoot at. Not quite as good as a testudo, but then, a schiltron isn't completely inept at melee combat either.

Also, don't just dismiss them as 'peasants with spears'. We have a separate unit of peasants to be the peasants. ;) That would be like calling longbowmen 'peasants with bows', as the french knights were happy to do until they got massacred :D