nope---not yet--hopefully in the next release---other then that, at this point, I don't know of any NLE that supports it. Most people run their files through DVfilmaker first and have had very good success---and it isn't very expensive:
Wake up.
Vegas does support 24P
It will support any framerate you give it.
Just convert your footage with DVfilmmaker, it will remove the extra frames and you'll then be able to edit at 24p.