partcombine for reduction of vocal parts

[Jean-Charles Malahieude]

Hi all,

For the piece I'm typesetting, I need a continuo part containing a 
reduction of the SATB.
As I encounter many warnings like

/home/jcharles/Partothek/Arthur/Act5/E/ntenor.ily:36:5:
Warning : already have slur
  f8[
     ( e f g] f4) d e4. fs8
/home/jcharles/Partothek/Arthur/Act5/E/nbasse.ily:36:17:
Warning : impossible de terminer la liaison
  d8[( cs d e] d4
                 ) c! bf4. a8

just because of melisma indication.

So, my question is, would it be possible to "tweak" the particombiner in 
a way that it ignores slurs?

TIA,
Jean-Charles