Chaav's laugh - Saving Throw

[Dredi]

When you cast Chaav's laugh any evil targets within range need to make a saving throw or suffer the spells negative effects.

Would it be possible to remove the visibility of this saving throw from the caster? Otherwise it can be used as a means to - even unintentionally - metagame the alignment of other players.

Would it also possible to add an effect to the completed casting, like the Balagarns Iron horn circular AOE effect? - Just something so other players can more easily recognise that a spell has been cast? - That, or an enforced emote, for the character releasing a laugh?