Stem for French Lute Tablature (Dowland)?

[Devin Ulibarri]

Hello,

In French Lute tablature (e.g. music of Dowland), the rhythm is:

1. notated as stems above the staff.
2. All the voices are truncated into one (example: if there is quarter
notes in top voice and half notes in bottom, they would all be notated
as quarter notes)
3. The flags are "double" what modern notation uses, so a quarter note
has one flag, eighth note has two flags, etc. Half notes have a kind of
very, very short flag to the left.
4. Stems are only indicated when there is a change in rhythmic value. If
there is a succession of the same rhythmic value, for example, only the
first note will be stemmed until there is a change (e.g. from eighth to
quarter, or eighth to half note, etc.)

This is a decent example: http://www.guitarandlute.com/tab.gif

And this is the file that I am working on:
https://github.com/pikurasa/MutopiaProject/blob/Dowland-Fantasie-7-Variatie-Robert-Dowland/ftp/DowlandJ/Lute/Fantasies/001/A-Fantasie-1-Robert-two-staves.ly

Does anyone know how to indicate this for the tab staff? Is there a
stock command that does this or a hack?

And if this feature does not exist, then where is the best place to
request it?

Thank you,
Devin