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Melt butter over low heat and stir in ginger and vanilla wafers.
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Reserve 3 tsps of crumb mixture.
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Press remainder in a 9 inch pie plate and chill while pudding is being made.
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Combine cornstarch and sugar; add 1 cup half and half, and whisk until cornstarch is dissolved.
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Stir in remaining half and half and bring to boil over medium heat, whisking, and cook 2 minutes, until thickened.
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Remove from heat and stir in vanilla and coconut.
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Transfer to a metal bowl set in a larger bowl of ice and water.
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Stir until completely cooled and pour into crust.
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Sprinkle reserved crumbs over.
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Chill for 20 minutes before serving (pudding will be soft).