> The one thing I think this patch still needs is a notice to the user that the 
> sash can be moved. Once place is one of the help files. I can do that. Can we 
> also put a line in the text box on startup?
> "Change text pane width by moving the divider ==>"

Is that really necessary?  Adjustable dividers like that have been a standard user interface element on desktop applications for a long time.  I would expect most users to be surprised to find that it didn't adjust.  And Tk, at least on the OS X ones I tried, provides a visual clue that the frame is adjustable by changing the cursor to a 2-headed arrow when mousing over the slider.  Adding something to the help files is sufficient, I think.