Yes, it is a problem with the "Open In" mechanism of iOS 6. It didn't happen in earlier versions of iOS as far as I am aware.

This is a bug in iOS 6 in combination with a duplicate definition of the .cs extension in Textastic's info.plist file. I'll fix this in the next update.

Textastic uses syntax definitions from TextMate. You can add your own custom syntax definition to the app:

http://www.textasticapp.com/v4/manual/lessons/How_can_I_add_my_own_syntax_definitions__themes_and_templates.html

Textastic uses the VHDL syntax definitions that is available at https://github.com/bpadalino/VHDL.tmbundle

You can try to add the new syntax to the language definition. The language is explained in the TextMate manual: http://manual.macromates.com/en/language_grammars

You can tap on the "+" button in the Files section and choose "Image". Then you can add an image from the camera or the photo library.

It's on my todo list.

If Textastic accessed location services, it would be shown as a separate app entry in the settings app. Also, iOS would ask the user if it would like to allow access to the location when it first tried to access location information.

I'm pretty sure that there's another app that accesses your location in the background.

I just tried it myself and for me the jquery mobile demo with local preview does not access any location information. There is no location symbol displayed in the status bar for me when I open the jquery mobile 1.2.0 demo in the local preview.

Please check that location isn't accessed by another app that is running in the background instead. You should see such a symbol near apps which accessed the location information in the "Ortungsdienste" settings list (as explained below that list).

Textastic doesn't use any location services. Are you requesting the location in a HTML page that you're previewing in the local preview? Which settings are you refering to? Can you please give me more details?