Staff group bracket ends not merged

[Wiz Aus]

Given the following:

\new StaffGroup
<<
\new Staff { R1 R1 R1 }
\new InnerStaffGroup
<<
\new Staff { R1 R1 R1 }
\new Staff { R1 R1 R1 }
> >

Both staff grouping brackets end at the same point.  In traditionally 
engraved scores (e.g. Dover's publication of Scheherazade), these ends are 
merged, or at least the inner ends are hidden.
It looks even more noticeable with 3 levels (the latter score has exactly 
this on, say, pg 12, V.Cello).

Speaking of which, how do you have more than 3 levels of staff bracketing? 
It seems to get three you need to use StaffGroup/ChoirStaff/InnerStaffGroup, 
but after that you're on your own.  If I wanted, say, the whole score with 
one bracket, the string section with another bracket, then violin I & II 
bracketed, and then violin I solo and violin I (rest) bracketed, it doesn't 
seem obvious how to do this.

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