ydgmms

I've had a working bootDVD for a couple of months now and it works great. I've had to update a few things (winamp, acrobat, firefox) But each time I have to copy the DVD back to the HD, then update what i need, CDIMage and burn. I tried extracting the ISO with WinRAR, updating it, CDImaging it but it wouldn't compress right. So I copied the DVD, and updated, CD imaged and it was perfect. Now I think about having the ISO on the HD and mounting it w/ daemon tools and then copy to HD. It cuts the copy time by at least half, if not more. BUT Is there anyway to update the ISO without having to extract it etc? Would a program like WinISO work with the way CDimage makes the ISO? I'm sure this has been asked before, but nothing came up during my searches (searched for 'updating iso' 'update iso') thanks