I've just discovered and love the Tomato firmware, and yesterday installed Shibby's K26USB v1.28 (the AIO build) on my Asus N66U. Once configured everything seemed fine until I tried renaming a folder on the externally mounted and NTFS formatted USB drive. It was initially used on a Windows based system, hence the partition format, and as it's a 2tb which is almost full I'd prefer not to reformat it. I've enabled auto sharing with read/write permissions, and I've tried adding /tmp/mnt/NAS to the Additional Shares List, and even tried addding it to /etc/fstab - all worked to share but I just cannot write! Before this installation I was running the stock Asus firmware and was able to add, edit and move files, so any ideas you might have would be really appreciated!
Oh, I've also followed the 'How to set up Nas, Optware, etc, FOR TOTAL NOOBS' thread with a 32Gb pen drive for the torrent client and can access it and read/write fine.