missile cavalry charge and blocking trade

[BenderBRodriguez]

hey guys, how do you 'charge' using missile cavalry/chariot, i mean the pahlav bodyguard's got 44 charge, kinda a waste if you cant use it, and same argument with casse's bodyguards.

also, can you use troops to block enemy's trade routes on land?

and sometimes even with melee cavalry, when charging at something (moving away from them) they slow down right before impact and as a result, the charge is lost, what gives?

and how do you melee with missile units if you dont to use up their arrows/javelin?

and for the same attack value, are arrows just as deadly as javelins?

thanks.