I've experimented with MagicISO but it didn't work right and I've messed with others like SARDU (careful with that installer, loaded with spyware BTW). I have yet to find a reliable method..
Hopefully they have recently taken it out recently, but when I messed with it about 4-5 months ago, it unloaded Sweetpacks which downloaded other nice goodies...I have installed SARDU on two computers and never ran into spyware problems. I don't know why people have this issue.