rolled chords, 8va, interstaff stems

[Ivan Middleton]

Having typeset piano music with Lilypond for some time now, I've noticed some
important features that seem to be missing (AFAIK, correct me if I'm wrong). 
Can anyone tell me if there are plans to implement these?

1)  rolled chords, i.e. a squiggly line at the side of a block chord

2)  8va brackets (yes, I know about changing the octave of a clef (for instance
\clef "G^8"; ))

3)  interstaff stems -- is it possible to connect the stems of simultaneous
notes on two different staves?

Thanks.

-Ivan