Before writing the Reading List plugin I did give a little thought as to whether Book Sync should incorporate the functionality. The problem is that they have totally different ways of thinking about lists. It has to have the ability to define multiple lists completely independently of devices you may want to sync them to.
As rewriting Book Sync yet again was too depressing a thought I just knocked up Reading List completely separately, and figured that anyone who wanted to sync the contents of a reading list could just view their list and right-click on it to add to a sync list. If they had multiple lists or wanted to send their list to multiple devices they could do this on demand without having to have some complicated "mapping" screen where they define all the relationships.
I won't say it would "never happen" and perhaps one day I will drum up the enthusiasm to incorporate the two together. Certainly a lot of their functionality is in common.
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