Joining barlines at the ends of lines?

[Andrew Giddings]

Hi all,

Does anyone know whether it's possible to automatically join the  
barlines at the ends of lines across all staffs?

I'm writing a piece for SATB+piano -- a ChoirStaff of two staffs,  
above a PianoStaff of two staffs also, all combined in a GrandStaff.   
So normally each barline is split into three separate bits: one on the  
top choir staff, one on the bottom choir staff, and one across both  
piano staffs.

What I'd *like* to be able to do is to specify that the last barline  
of each line -- each barline down the right-hand edge of the page --  
should join up across all four staffs, just like at the start of each  
line.

(I find this makes it a lot easier to find your place when moving down  
to the next line.  Of course, it's a bigger problem the more staffs  
there are, but I think it's a good principle even with just three or  
four.)

Also, if that's possible, it'd be nice to join up the the 'special'  
barlines: double-barlines, repeat marks, etc. in a similar way.  (That  
might need care around lyrics, of course.)

I've searched the manual, the mailing list archive, and the web, but I  
couldn't see anything directly relevant.  (I'm using the latest stable  
LilyPond 2.12.2 on Mac OS X, if that matters.)

Thanks all,
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