Unit abilities

I just wanted to throw out this idea I've had for some time and hopefully see what the community thinks about it. Basically, it is about giving abilities to certain units. Heroes could have some abilities like forced marches or temporary boosts. Another use could be to implement things like "Charging" for elephants and cavalry. There could be some other fun uses too. A unit can't do this without restrictions of course. Could make it cost resources and given a re-charging time in addition to

@(-_-) I would like to see - melee cavalry/elephants : charge ability when they are attacking infantry (auto cast / enable disable) - ability to build canal / traps to kill enemy infantry or reduce speed of ram... (Enable/disable) - ability to use ladder to attack walls / defense towers to kill garrisoned unit (Enable/disable) - Ability to build Not-mobile ram to destroy buildings , only deploy near wall or building to use it to destroy it (Enable/disable) - Ab