I like your text editor! But please support new VHDL syntax from VHDL-2008. I bought this specifically to edit VHDL and Tex. For a start, have block comments at least.
Textastic uses syntax definitions from TextMate. You can add your own custom syntax definition to the app:
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
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