To be honest the on-hover feature is the ONE feature of this add-on that has NOTHING to do with it's real purpose (image management). I'm not sure why your client feels that this is a MUST HAVE feature, it adds NOTHING to the site to enhance the sale of actual products.. but to each their own I say..
As I said, its not a feature that has ever been included nor are there any plans to include this feature. So as I previously stated, the only suggestion I can give you if your client is INSISTING on this feature and it's beyond the scope of your knowledge to execute, you will need to employ the services of a developer who can create this feature for you.
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