Be able to specify maximum size for artwork in kbs rather than pixels

I would love to be able to tell jaikoz to scale large artwork down to a specific file size instead of resolution. For instance, set all artwork to a max of 512kb so that if i add a 1mb file it just makes it smaller until it fits that 512kb cap. Anything already under 512kb is unaffected. That way i get the best resolution for the size. Also, does jaikoz do any png optimization of any kind?