As of version 1.3, DroidEdit allows users to open and save files using SFTP. This feature is still in its early stages, so minor hiccups are expected. I hope you bear with us as we are trying hard to take DroidEdit to the next level.
Please contact us if you have any problem using SFTP. You can comment in this post or drop us an e-mail.
Documentation on how to use SFTP with DroidEdit can be found in the help page.