Could it be possible to create the file or folder when I tap the return key instead of moving to the top of the screen and taping the Done button.

I'd like syntax highlighting for restructuredtext format in particular. more generally I suspect most folks would like Textile, markdown and possibly some other plaintext markup standards

While a C++ compiler may not be allowed in the app store, one could add the code analysis part of clang/llvm for code completion and remote xcode control for compilation. 

It seems that this has not been suggested yet.
If a file is "open" in edit mode, it can be downloaded from web dav or even within the same app.

1) create a close button to allow people close the file, so to commit any pending change or whatever is necessary.
To "unlock" the file it looks like the only thing to do is to move to a different file. But it is going to create a loop if you don't have a dummy file in the folder.

2) within the file transfer panel, if someone attempts to delete an opened file, just propose a pop-up that inform the file is opened in editing. Ask what to do
a) close with save
b) close without save

I'm finding the small line, column view in the top right corner of the screen to cover the text I'm working with, and I don't need it. Is there a way to hide it?

It's a bit nerve wracking to wonder if a file is saved, especially after a lot of time spent working. It would be nice to have an indicator showing when a file is saved or saving, or a way to manually save a file - a button or icon to click

If all files in one folder are linked to the same folder on the ftp server, then creating a new file should autolink this connection.
Maybe you could implement a toogle in the new file window, that this connection will be established automatically.

Hey there, good job. One minor improvement based on the Textastic 4.0 could be implementing the code completion for keyboard users as well. Right now, there's no way of using the keyboard to navigate through the suggestions and accepting them with the return key. else nice work.