The viewer does support plugins, I think there are even some existing plugins for it, such as the text to speech plugin.
But, as BR said, the viewer is being re-written. Once that rewrite is done and calibre 4 is released, feel free to ping me and we can discuss the requires API for plugins in the new viewer. The bonus is that if you write a plugin fo rthe new viewer you will be able to adadpt it to the in-browser viewer that is part of the calibre content server relatively easily as well.
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