[TxMt] Shift-Tab to align a block of code

In other text editors (in my pre-mac days), I very commonly used the block editing feature to quickly align code. I would use a regular expression match/replace to insert in a bunch of whitespace where I need it, then block select where I want the column to start and shift- tab to squeeze all of the text back into a nice column.

TextMate does most of the above quite nicely, with the exception of the shift-tab. Shift-tab does not shift everything left, eventually squeezing out the whitespace and leaving a nicely aligned column. Can I do this somehow, and if not could it be added? (I really miss this feature)

Thanks...

Jim Leask