bwplot(): Can Panel Heading Span Two Lines?

A conditioning factor for bwplot() is the stream name. There are 17
streams so each panel is comparatively small and the names in the panel
header are truncated at both ends. I would like to wrap the names on two
lines for each panel but do not see if this can be done when I look at the
online docs (?bwplot) or the Lattice book. Is there a way to fit long
strings as headers with multiple panels on a page?

Rich