Knoppix has this feature and have had it for a whlie now, and it can be EASILY implemented. (For DEVS, look at knoppix source)
My request is for the sabayon team to implement a feature in the Live cd which lets you boot from a iso file located in a NTFS partition. I give you a scenario to clarify: You put LIVE cd disc and and reboot, then you type "sabayon bootfrom c:\sabayon-minix86.iso" for instance, then it mounts the iso and boots from it, this fills many purposes. 1. It's faster 2.lets you mount a disc later on in system, which is good.
Sabayon LIVE cd have a similiar feature like that, but it copies the iso to ram and thus lets you boot from it and you can mount a disc later on. This has weak points; 1. you might not have sufficient RAM 2. you have to wait for it to copy the whole thing, takes time.
Good Luck!
(For DEVS, look at knoppix source)