I'll have a look at how this can be done for a sandboxed Mac App Store app.

Which command would you prefer? "textastic" or something else? (TextMate uses "mate" for example)

Thanks for your feedback. It's easier for everyone if every topic in the feedback forum is about one thing.

There are already existing topics for your points that you can vote for or comment on:

Edit live files: http://feedback.textasticapp.com/topic/27218-edit-live-files/

JavaScript debug console: http://feedback.textasticapp.com/topic/32860-javascript-debug-console/

I think "AutoBackup" is a new idea though.

That looks really interesting. I'll have a look.

iOS 6 changed the "Open In" behavior. For some reason, the OS changes the file extension to the first one that is registered for this file type. For example ".md" files are renamed to ".markdown". There's nothing I can do on my end. I already reported it as a bug to Apple because I think the system should not change file extensions.

Reboot fixed the issue. 

How exactly did you "import" the file?

Das ist seltsam. An meinem Retina-Macbook geht es: https://dl.dropbox.com/u/296640/launchpad_retina.jpg

Eventuell hilft ein Neustart?

You need to copy the tmbundle folder into the #Textastic folder.

Can you please send me an example file to support@textasticapp.com?

Textastic uses the Discount Markdown library. It's certainly possible that it has bugs.