As promised I post a link to my mod of the plugin here.
It is still rough, the styling of the drop-down and the buttons still has to be done.
Two questions to @jeremyruston :
Is it already possible to filter the annotations displayed for example by modifier or by tag?
(For example only those tagged vocabulary for reading and those tagged stage for rehearsals…)
Meanwhile I found the answer: yes - and it is implemented in the control-panel.
Is it possible to display the annotations of a Tiddler in ther order of their appearance in the text?
This would be usefull, e.g. to add a dictionary with the vocabulary below the text.