Something could probably be done but the periods are always stripped out in preprocessing, you would have to use something else.
MSAgent has a verbal pause command of some sort if I recall correctly, but I don't know what Haptek has.
The best way might be to ask Robert for a <PAUSE Nms> type tag we could use in the next version.
I would not be interested in making or using such a plugin. I don't want to hinder my robot just for Esthetics. Just like my hammer is better at hitting nails than I am, my robot is better at delivering information than I am, it doesn't need to hesitate.