Title says it all. I'm sure it'd be easy to implement; its used for Oseem with stones. This would save time, especially given the 8 different types of crystals and the animations used each time, and usually trading a small amount of each time, usually during Mog gardening. Small improvement, but would be handy.
Thank you.
-Jiko
Edit: Corrected some grammatical errors and added about the animation time for each trade.