UI user event integration point ("UI hooks")

It would be nice to be able to add logic to the functionality of the UI. ( above the Grouper API/DB layer. )

As a specific example ( but not limited to this single case ) it would be helpful to be able to "get control and do something else" when a user tries to add an existing member to a group.

Examples of what "something else" might be:

    Give them a helpful message

    Add attributes to the indicated user's existing Membership

    Route the user to a different screen ( like attributes on the users existing Membership )

   Prompt the user if they want to "remove the user" ( better than searching a large group of users to remove them. )

To be clear "Adding a member" is only one of the UI actions that I would like to be able to "intercept and extend". ( Basically any button/function in the UI would be useful. )