I'm really sorry but I don't understand the question.
I don't think someone could want just to add points but to model/modify the mesh and, in this case, there are several tools available to get what you are looking for...
If you want just to "add poins" you can use the normal/standard ArchiCAD procedure: select the mesh and with the mesh tool active click on the mesh to add new points.
This procedure is already available in ArchiCAD so why we have to provide the users with a double of it?
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Fabrizio
Fabrizio Diodati
Graphisoft Italy Srl | Via Rossignago 2/A Spinea Venezia 30038 Italy