Unable to embed vertical tab (linefeed) in typed data

[wb <wb vallnet com>]

I am using gnumeric 1.2.6 on a stock Mandrake 10.0 installation.

I have been unable to insert a linefeed in a cell's text.  I can import 
cells from Excel containing vertical tabs, and it is handled OK.

I have been unable to find a way to edit these unprintable characters 
into text data inputs.

As an encompassing problem, I am unable to cut and paste WITHIN cells.  
For instance, cutting one character from withing the text in a cell, 
and pasting that one cut character inside the text in another cell.

Is there any way to do this?  Is there a plan to do this?  Do I just 
need to upgrade?
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