Indicate if a Custom Field Type is provided by Craft or a plugin

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It would be quite helpful when creating or editing a field if the "Field Type" dropdown provided some sort of indication of where a field type comes from; if it's a native Craft field or a plugin (and which one).

There's a number of plugins that already kinda force-apply this in various ways; the Button Box plugin prepends all its fieldtypes with "Button Box - ", while the Super Dynamic Fields plugin appends " [Super Dynamic Fields]" to each of its fields.

EDIT: Another idea would be to emulate the native HTML feature of <optgroup> in <select>—group the Craft fieldtypes first, then the rest grouped by each plugin.

Here's some mockups (and yes, I know the title="..." attr is frowned upon; I both don't really care for mockup purposes, and have no problem with whatever built-in tooltip functionality Craft's CP might have instead).