I don't know if this is the correct section for this question; but what about an upgraded vfs system that allows you to write on multiple destinations points aswell as reading?
In the current beta you can mount several dirs/drives into the same vfs path, and download from all dirs, however, if you try and upload anything you only store stuff on the last entry.. :\ Would be great if ioFTPD used some sort of spanned/lvm logic to fill up the first entry (drive) first, and then move on to the next