Note direction under curves in one-part music

[Basil Crow]

Hi all,

If I put a slur on a D and E, the slur will go beneath the notes and 
look nice. If I put it on an A and B, the B will have the stem down in 
one-part music, and the slur will be awkwardly placed between a stem-up 
and stem-down note. But if the B is flipped so that its stem faces up, 
the slur can go beneath the two notes just like with the D and E.

As far as I know it is a standard typesetting convention to examine 
slurred phrases (well, not just slurred phrases, but for this example), 
and if their notes have mixed stem directions, to change them to have 
the same stem direction (leaving the majority intact and forcing the 
rest to conform).

Han-Wen has mentioned to me privately that this could be done as a 
sponsored feature for 130 euro (incl VAT and/or transfer fees). Is 
anyone else interested in this feature who would be willing to sponsor 
it with me?

Thanks,
Basil