half height barline | full width staves

[mj]

Hi all!

Two small questions:

1) Is there an easy way to get half-height barlines..? (so only through 
the top two staff lines) (I have used ticks now, but that's not quite it)

2) I would like my music to be spaced normally, but the staves to always 
span the entire page from left to right. (so: leaving unused empty staff 
space on the right half of the page) I am using \break for the staff 
breaks, but this spreads my music evenly across the entire line)

Suggestions how to achieve this?

Best regards,
MJ