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Textastic 4.0 will support multiline tabbing and untabbing using the virtual keyboard and external keyboards (select text and press tab and shift-tab).
Textastic 4.0 will support regular expression find and replace.
Textastic 4.0 will have remote preview support.
Textastic 4.0 will have a new row of additional keys that allows you to enter all available special characters by swiping over them. This eliminates the need for configurable buttons.
Textastic 4.0 will have code completion for HTML, CSS and for PHP functions.
This is the new preview screen. It allows you to enter a local path to preview for each file. So, for example, if you want to preview changes to a JavaScript or CSS file, you can enter the path of a HTML file that uses it.

You can also enter a remote url so you don't need to switch to Safari.

Here you can see the new keys in the additional row above the standard keyboard. You can swipe over the keys in the direction of the special character you want to enter. This allows you to quickly reach all special characters without the need to scroll.

The tab button also supports untab (to indent and unindent code), delete forward, go to line start and go to line end. 
 
I've just added basic support for symbolic links in Textastic 4.0. I will submit this version to Apple today.
You could try to use a hard link instead of a symbol link (don't use the "-s" switch).

That said, I don't support jailbroken devices - I don't even have one.
Possibly. But I've added support for Firebug Lite in Textastic 4.0. I'm going to submit this version to Apple today.