voltaOnThisStaff property in the master file's \layout block

[Romel Anthony S. Bismonte]

I found the following fix in the LSR, which puts volta brackets above the 
chord names:

\version "2.10.0"
\score { <<
 \new ChordNames \with {
   voltaOnThisStaff = ##t
 } \chordmode {
   c1 c
 }
 \new Staff \with {
   voltaOnThisStaff = ##f
 }
 {
   \repeat volta 2 { c'1 } \alternative { c' }
 }
> > }

The thing is, I have a lot of these music files I would like to do this to. 
The idea is that there is one master file, which contains paper, layout 
settings, scheme functions, static music identifiers, and so on, and then 
there are several \include statements in there that contain the actual 
pieces. Is there a way to set the voltaOnThisStaff property in the layout 
block in the master file?

Of course, it would be OK if this were not settable in the master file; I 
could just edit the individual music files to contain the definition. But 
something tells me that there must be a way.

Thanks in advance for any input.

Romel