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"Help -> About <feature> -> Plug-in Details" lists all the plug-ins in the registry. But from the user point of view, they could very well be thinking they are getting a listing of all the plug-ins that Workbench GUI is based on; that is, the list of plug-ins that are started. From the point of view of a ISV providing an application based on in set of plug-ins specified in a USER-INCLUDE list of a platform.cfg file, they would like to see this list of plug-ins distinguished from the list of plug-ins from IPluginDescriptor. One way of providing this feature would be to add an appropriately-labeled column with a check mark to the current list. This might be done in conjunction with 31094, which is considering adding other columns. This feature also would help create a rich client platform (36967).
I think the functionality you are looking for already exists. Try Help -> About Eclipse Platform -> Configuration Details
I was wrong. Only the plugins used are listed.