Indicating duration with lines

[Urs Liska]

I really don't seem to find useful search terms :-(

I'm trying to achieve horizontal lines "extending" the note head to
indicate its duration. The attachement is done by abusing \glissando.
I'd be (mostly) happy with the appearance, but glissandi work only in
place where a tie is. When there's a different note or a rest after the
original note it doesn't.

What would be a term for this notation element, and is there a ready-
made solution, e.g. in the LSR?

Thanks
Urs

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