no grid for single par

[Hraban <angerweit@gmx.net>]

My book has "grid=yes", but I need several paragraphs with small text
that should use their standard linefeed. They are defined as an own
environment (\definestartstop).
I tried to use \startlinecorrection, but it disables the wrapping.

Is it possible to typeset the whole text block, perhaps as buffer, and
align it to the next grid line?

Same with subjects/titles: The normal linespacing is too small (or too
stretched) for other text sizes. Can I switch off the grid setting for
all headers?

hraban.