I just installed the 1.5 RC4 release so I could use the pricing fields, and it appears that the price fields have no tabindex? Is there a work around for that?
It could also be because I used some conditional logic (although the hidden fields have the proper tabindex) and some section breaks, but looking at the source, it does not appear that there are tabindexes at all for the price fields (on the ginput_quantity inputs.)
Form is here: http://is.gd/wAUq9k