A better vertical frame

Vertical frames are useful but counterintuitive, and offer less control than one would expect. I often want to add a bit of space between a pair of staves (I seem to be doing a lot of exercises where virtually every staff ends with a double bar.) I add extra space between groups of related material. Adding a vertical frame lets me add a HUGE space, which I can then tweak down to a FAIRLY LARGE space, but fine adjustments are not really practical -- I'm thinking of the things we do routinely with word processors, Adobe Illustrator/InDesign,etc. It seems logical to expect fine control over how much spacing (leading) is inserted between page elements.

Also, I'm sure plenty of comments have been made about the strange requirement to insert a horizontal frame within a vertical frame to enable creation of a text block. Again, intuitively we'd expect to be able to plop blocks of whitespace or text at any point on the page, either with or without interrupting the flow of staves and systems, and without introducing surprising concepts. Sorry if this issue has all been thrashed out for 2.0.