The editor interface is great, but file creation flow for the remote server is too slow. We need to first create a file locally, then edit it, then upload manually onto the server. Why don't just support *Link* for folders? When I download a folder from a server, it should be linked to the remote server and any new files I add into the folder should just be automatically uploaded into the same folder in the server.

Add php runtime to allow running php scripts locally.  I have kodiak installed on my ipad which does just that. Textastic could benefit. 

a lot of file extensions are not associated or having the option to open them with textastic app using Files/iCloud/OneDrive/etc..

Please add the ability to edit any text based file extension from there. 

I would love to see a code minimap with syntax highlighting support make its way to Textastic especially for use on my iPad Pro 12.9inch 2nd-gen.

This will bring your app one step closer to desktop counterparts (Atom, Sublime, Visual Studio Code, etc.) and I’m sure will make a lot of power users who wish to stay mobile very happy :)

When I add a new FTP I'd like to be able to use 1Password.

The JavaScript support is already great, but help with the jQuery functions would be a big time-saver as well.