I think you'd need to omit the beams:
\version "2.19.81"
\score {
<<
\new PianoStaff <<
\new Staff { \time 6/8 fis'4. \stemDown a' }
\new Staff { \time 6/8 \clef bass \crossStaff { <fis fis,>4. < a!
a,!> } }
>>
\new PianoStaff <<
\new Staff { \time 6/8 r8 <a' a''> q \stemUp q[ q] \stemDown q }
\new Staff { \time 6/8 \clef bass r8 \crossStaff { a8 a \stemUp
a\noBeam a\noBeam
\stemDown a } }
>>
>>
\layout {
\context {
\PianoStaff
\consists #Span_stem_engraver
}
}
}
Cheers
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