I'm searching for more powerful annotation library than
marginpar. In particular, I would like to have the feature to center the annotation vertically in the corresponding paragraph.
marginnote seems to be better suited for the case of floating objects. However it lacks of the above feature as well.
I had partial success by wrapping the contents of the paragraph into a
minipage with center alignment. However, this approach cannot handle page breaks.
Is there a more powerful package than
marginnote that features the above requirement?