Currently, there is no code completion for Fortran. Textastic supports code completion for HTML, CSS, JavaScript, C, PHP and Objective-C.

No, sorry, I don't have a date. I submitted version 1.1 two days ago which adds tabs among other things. I'm going to concentrate on the iOS version now for a while and plan to add column mode after that.

In this case, you would just browse files on the remote server. If you want to edit a file, Textastic downloads the file and let's you edit it. If you are done, you can either save or discard your changes. Saving would upload the file to the server.

Since you are working on the remote server, deleting a file would delete it on the remote server. You would also be able to add files and folders.

I'm currently focusing on iCloud support which will be available in the next update. I plan to add live editing for the version after that. I can't tell you right now how long it's going to take to implement.

Currently, the best way is probably to use the quick upload feature (http://www.textasticapp.com/v4/manual/lessons/How_can_I_quickly_upload_downloaded_files.html) to immediately upload your changes after you made them.

I plan to add a feature in a future version that allows you to work live on a remote server which automatically handles uploading and downloading of files transparently for the user.

I see. Textastic doesn't implement this, sorry.

Currently, there's no way to hide it.

Sorry, but I'm not aware how this feature would work. Which editor implements this?

Version 1.0 wrongly uses the directory that's used in the iOS apps:  ~/Library/Containers/com.textasticapp.textastic-mac/Data/Documents/#Textastic/CodeCompletion

I submitted version 1.1 yesterday which is going to use the directory you mentioned.

I've had a look at a similar problem yesterday. I'm not sure if this is even possible for a sandboxed Mac App Store app which typically can't launch other arbitrary apps or execute AppleScript.

You can just use File -> New or Cmd-N and the Open dialog will close.