Slitherine

I'm uncertain about the interaction of being irregular light cavalry thus being skirmishers but also impetuous which units does one have to take a CMT not to charge ? Only things that irregular light cavalry could normally charge? (Flank, Rear assaults, skirmishers, wavering, broken. ) or everything?

Terry answered this one previously. Impetuous troops only impetuously charge things they are allowed to charge normally.
So impetuous irregular LC are only impetuous against other skirmishers, wavering or broken opponents, or the flanks or rear of any enemy.