Having tinkered with the unit stats to my satisfaction (for today at any rate! ) I'd like to alter modify some of the recruitment stats, as follows:

Romans:
Block recruitment of Legionary and Praetorian Cavalry, make Praetorian and Urban Cohorts recruitable only in Rome.

Britons:
Make it possible to recruit Barbarian Cavalry, block recruitment of Heavy Chariots.

Egyptians:
Block recruitment of Heavy Chariots.

Idiot-friendly advice would be very much appreciated!