I spoke with Chris about multiple instances. While this is something we plan on implementing in the future, it is not a easy thing to do and will require the module to be reworked. I suspect it will be some time before this get's done.
The module was just never imagined to be used in the way you are trying to use it. It is a cool idea, but the module was initially envisioned for one person, basically as a side module for a quick email. Not as a multiple person, multiple tabbed, contact manager.
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