If any breath weapon you have deals the right energy type of damage, then it is receiving a boost. Dragons can take these classes and boost their breath weapons.
I'll be partly addressing that with the secondary God-based classes, by boosting up Bahamut's breath. It has always been in the shadow of Tiamat's breath, which is a problem with the breath effects, not the classes.
I suspect that some of that comes from copy/pasting. I'll look it over. Glad you like it!