Improve Sequence Diagram Message Label Layout

[Jeff B]

Is there any way to make the message labels in sequence diagrams have a better default layout?

First, they seem to try to be aligned to the center of the message link rather than toward the sender.

Second, once the initial width is established, any edits to the message invariably causes the text to wrap.  I believe the diagrams are much more readable when the message label is in one line (unless, of course that extends beyond the bounds of the diagram).