Well you can include the sites you want to add so that it is restricted to what you need and tat wat i did "edu" for universities and added 6 websites for the other portals...
im not sure if im clear here....but all these are pretty apparent on the control panel
What are the key "customization" aspects the API let's you change? If you could share more about what you've learned form all your reading, more of us could contribute our thoughts ...