Insert new pitches

[lucifree]

Hi all,

I wanted to add new pitches for percussion, eg : a second crash cymbal. 
So i copied the drumPitchNames  section from drumpitch-init.ly into my 
document, then added two new lines :

drumPitchNames =
#'(
  (crashcymbalbis . crashcymbalbis)
  (cymk . crashcymbalbis)
 
 % then copied here all other lines
  .....
)

(I also have a section 'myDrums' as explained in doc to set all my note 
heads & positions.)

The question is : there is a syntaxic way to ADD my new pitch to the 
default drumPitchNames structure rather than COPY it all ?? (and so 
benefit of later modifications in distributed file, reduce/simplify my 
doc length, etc...)

Thanks,
L.