Projectiles/turret action parameters

[KaraUL!]

Hi all, does anyone know if there is a list of possible parameters and types of "action", "action_delivery", "target_effects", "target_type" (like "projectile" and "instant" types of "action_delivery"), using in projectiles/turrets descriptions? Or for example can we get a turret current target runtime? I'm trying to add chain-lightning effect without scripting manual damage to findenemyunits every N ticks. Sry for my english, thx.