[TxMt] right margin indicator

[Thomas Krajacic]

I have to develop with someone else's styleguide and it requires to  
break every line at 80 characters.

Is it possible to get any visual clue where r.g. 80 columns are?(I  
mean a vertical line like most texteditors have... not the column  
number on the bottom)
Would be nice to have that feature, since the "right margin indicator"  
as is present in textmate is pretty useless I think.
It only shows where the window is larger than the rightmost column  
fully visible?(What is it for anyway?)

Maybe I am just missing something...

Thomas