Greetings,
It would be nice that, unlike EU retail, the weapon switch delay would be removed. While this is of some effect to some classes, it is most effective on gunner of which weapon switching is a more essential core part of the class design which requires frequent and rapid weapon switching in order to do their full DPS.
The current delay is not affected by player latency and it's removal has been noted on other servers as well (not only on not aion). It lasts even up to 1 to 2 full seconds in real-time before weapon switching takes effect, essentially making this a "dead time" in which no skill can be used.