User blog comment:SirAston/URF and the LoL Engine - A To-Do List/@comment-3974211-20140404030403

The cast time of abilities functions as a minimum cooldown. A champion cannot cast an ability that they are in the process of casting.


 * Disintegrate halves the current cooldown each time it kills a target.
 * Jarvan will travel to the furthest most flag.
 * Pix will follow the last person to receive the shield.
 * Malphite's bonus movement speed is a non-stacking debuff - each cast will replace the previous.
 * Multiple Whirling Deaths can exist simultaneously.
 * Rampage's 1 second cooldown reduction does seem to apply - but the casting time prevents it being reactivated until it is finished.
 * Unfortunately, casting Twilight Shroud will break stealth - so Akali is visible briefly. (this should be fixed in my opinion)
 * Any ground targeted area of effect will not stack as the damage is a unique debuff to enemies. This would have been implemented in One For All, if it wasn't already a feature of the software.
 * Yorick has always been limited to one of each ghoul. It's possible even on live to attempt to summon a second one while the existing ones are in effect.