Im not sure how feasable this is, but along the lines of what was said earlier, if you are using xbox power to run the ftp server then it will slow stuff down equally if you implement the ability to run little modules to the bios. The bios when it loads can do the regular run of evoxdash, nexgendash..... but at the same time search a specific directory for modules such as a format util or ftp server. these could be individual files that contain all coding and stuff inside them, thus modules are a single file away. I really am out of my depth here and i know this doesnt help the idea of pluging in your xbox and all is ready to ftp to it, but if would allow you to easily set up a system that can do a few things at once and is easy for noobs to use and configure....
just my random thoughts going through my head...