
Command + T to open new tab
I have never seen an app that supports tabs without this keyboard shortcut.
Command + T should open a new tab,
Command + N should open a new window.

Ability to disable line wrapping per document
In general I want line wrapping to be on. But very often when working with a document (or more precisely, large blobs of text that I paste into a document) I want to view it without line wrapping.
Disabling global line wrapping for these one off tasks becomes tedious.

Balance tags
I Would like to be able to "balance" tags: hit a keystroke to select all content between two tags (preferably without the tags themselves) to quickly edit its content.

Record and play macros
I understand this may take time to implement due to the complexity of the feature, but it would be nice to have the ability to record and play macros similar to what Vim/SublimeText is doing.

Run or View Output with Button
It would be very convenient to have a button that would open HTML files in default browser, automatically put in the code to compile/run a file in Terminal. Love the app and would love this feature, too.

Switch tab shortcuts, or, full shortcut management.
Use of ⌃⇥ and ⌃⇧⇥ is normal on Windows, but on Mac every application I've ever used (Xcode, TextMate, Chocolat, Safari, Adium, Chrome, etc.) uses ⌘⇧] and ⌘⇧[. Allowing us to define our own keyboard shortcuts would avoid having a single hard-coded value that not everyone appreciates. ;)

The next version will support both Ctrl-Tab and Cmd-{ to switch to the next tab. It will show Cmd-{ as the shortcut in the Window menu, but it will actually respond to both keyboard shortcuts.
Ditto for "select previous tab".

Auto add extension based on selected Syntax
When I go to save a document in Textastic, I feel it should default to the file extension of the language syntax I have selected. After all, if the user is writing in Python, 90% of the time they'll want to use .py right?

Display XML documents properly
Is there a way of viewing the structure of XML documents?
When opening an XML file in Chrome I can see the structure clearly like this: http://screencast.com/t/8SGsOvtG
In Textastic, it just shows one block of text which is not useful if you want to make edits! See: http://screencast.com/t/H392U9eZV9M

css properties
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