Code folding that allows the user to selectively hide and display sections of a currently-edited file as a part of routine edit operations. This allows the user to manage large amounts of text while viewing only those subsections of the text that are specifically relevant at any given time.

When an ending parenthesis, curly bracket and/or square bracket is typed or the cursor is placed near one, it shows the matching parenthesis/bracket.

Instead of opening files individually, have the user open a base directory. There should then be a file browser that allows the user to quickly switch between files in the selected folder and its subfolders.

There should be a simple way to comment out lines & blocks of code on all platforms.

Add the ability to open several files in a single window. Use a tab control to switch between files.

I just got Textastic from the Mac App Store.  Good first start.  I am working on a very long Multimarkdown file and I like the navigation.  What I would like to see is regular expressions for both find and find & replace.

It seems like there is no print support in the Mac version. Is this correct?

I think a paid editor should be able to print. 

Column selection mode:  Ability to select/copy/paste a column of text

I can't live without terminal integration of some sort. What about a way to invoke Textastic from the command line?