The best solution to this in my opinion is to let us have the option. Clearly a trait is going to screw things up for people. While some don't mind this others would rather things be consistent so we can macro our gear in properly. Give us a piece of gear that has the trait on it. If we want to use it we can macro it in, if we don't then we don't. This way we can control the issue and limit it to only the spells we'd not mind insta-casting. The JA that they are giving us sounds like a gimp version of CS for one spell that doesn't instant cast so much as reduce casting time and doesn't affect recast but there is still a chance it could be used on others which I suppose is alright but @.@.