Is SFTP available for Tomato USB? Or is it already available and needs to be configured. I would highly recommend a simple web GUI that can setup and configure SFTP server. Similar to the already built-in FTP server that can be configured and will be up and running in seconds. The reason why I think this will be a great feature to have is because you can transfer files securely and there are free Android and Apple iPhone clients that can connect via SFTP to upload & download files.
I have Netgear WNR3500L router running tomato-K26USB-1.28.2453MIPSR2-Toastman-VPN-BT