Thanks for your replies.
I understand that what I want is, in LilyPond, impossible by regular means, and/or unusual if realized by a weird trick, moving a note-head to the wrong side of the stem. That would be rather ugly, I think.
Still, what I want to do is not my idea. To illustrate what I'm talking about I will have to include two more screenshots from serious publications.
and . 
Different works from the same composer.
Does it look wrong or repulsive?
Would it really be impossible to realize it in LilyPond?
Btw, I just see another posible dirty trick to realize it.
Thanks anyway,
Best regards,
Robert Blackstone
On 9 Feb 2018, at 13:29 , Andrew Bernard <address@hidden> wrote:
Hi Robert,It would be unusual to glue stems together as you are suggesting, if I understand what you want correctly. To use the crossStaff construct the stems have to be in the same direction. No negotiation. :-)If you really wanted to insist, there are examples of how to move individual noteheads in chords from one side of a stem to another on LSR, but I can't say that this would result on notation in this example that players would be expecting or comfortable with. My principal aim in engraving is to increase clarity, and I fell that non standard constructs reduce clarity and make the music slower to read.Andrew