It's registered as a secondary viewer for all files so that it is able to open files with unknown extensions. This has the side-effect that it's also shown for image files. If I disable this, you lose the ability to open a ".mycustomfileextension" file in the app. Coda probably does the same.

I think I could disable it for image files. I'll see what I can do.

Voice over is now supported for the main text editor in iOS 6.

Yes, since iOS 6, Textastic has good voice over support. See http://www.applevis.com/apps/ios/productivity/textastic-–-syntax-highlighting-ftp-sftp-dropbox:

*** UPDATE ***
As of December 8, 2012 this app is accessible on the iPad. I am now able to navigate the text areas as I would any other document in IOS. I wanted to leave the original negative review hear to give credit to the developer for finally making this excellent code writing and management app accessible.

Danke! Beim letzten Video konnte ich es jetzt gerade tatsächlich auf meinem Macbook Pro nachstellen! Seltsam, dass das vorher nicht geklappt hat.

Aber nun hab ich einen Anhaltspunkt, an was es liegen könnte. Ich versuche, das Problem zu beheben!

Und ja: Tabs sind Top-Priorität - das vermisse ich selbst auch am meisten.

Yes, if you tap and hold them. 

You can already do that using either the action button in the top right corner or by tapping and holding a file. ("Send as attachment")

By the way: I did follow the steps and it is working just fine on my Macs...

One thing that can fix problems with file type registrations is to rebuild the launch services database.

Have a look at http://www.tuaw.com/2009/06/11/terminal-tips-rebuild-your-launch-services-database-to-clean-up/ on how to do this.

This is just a shot in the dark, but might be worth a try.

Mich würde ja interessieren, ob es auf einem anderen Mac geht. Oder ist das der einzige verfügbare Rechner?