No. Flamingo and Penguin are renderers - for making images - so unless you're doing that, you don't need them. Bongo is for keyframe animation so you can make objects move and create small video clips... If you don't do presentations, you won't need that either.
If you're looking for add-ons, you might want to look at Spaceclaim, which will extend Rhino's 3D modeling capacity to give it real-time solids editing capabilities... Otherwise, you'll be fine with just Rhino for modeling. You also might want to look at VisualMill/RhinoCAM and/or MadCAM for CAM software. --ch