Re:

[ghe]

Thank you, Thomas!

> Not sure I understood correct.
> Though, how about:
>
> \version "2.16.2"

Alas, I use 2.14.2...

> spaceRight =
> #(define-music-function (parser location space)(number?)
>  (let* ((amount (+ space 0.5))
>         (space-right `(extra-space . ,amount)))
>  #{
>     %% Maybe additional layout-objects must be affected!?
>     \override Score.BarLine #'space-alist #'right-edge = #space-right
>     \override Score.KeySignature #'space-alist #'right-edge = #space-right
>     \override Score.KeyCancellation #'space-alist #'right-edge = #space-right
>     \override Score.TimeSignature #'space-alist #'right-edge = #space-right
>  #}))
>
> {
>   % commented settings for testings
>
>   \spaceRight #30
>   %\key d\major
>   a\( b c d~(
>   %\breathe
>   \break
>   %\time 8/8
>   %\clef alto
>   \key cis\major
>   d4 b) c\) d \bar "|."
> }

... and this example segfauts, with the following error:

<string>:3:73: error: GUILE signaled an error for the expression beginning here
     \override Score.BarLine #(quote space-alist) #(quote right-edge) = #
                                                                         
space-right
Unbound variable: space-right