Yeah, the crystal setup is pretty misleading, comes from trying to make a common case for all of the world? FCC does not allow this in the US, possibly due to our closer channel spacings(?), You'll note that there is a spot of glue that supposedlly prevents us from swapping crystals, but generally no mention in manuals. I have seen 2 cases of interference caused by TX crystal swapping.

This question is so "popular" RCG has a sticky in their radio section.

http://www.rcgroups.com/forums/showthread.php?t=94580