Google API quota usage conditions

I'm looking for ways to overcome API quotas without resorting to requesting a raise, and would like to know what is classified as .. per user.

For example:

• Google People API has this quota: Read Requests per 100 seconds per user
• I setup an OAuth Client ID: 123-5ampl3.apps.googleusercontent.com
• And for whatever reason, my queries are going to exceed "100 seconds per user".

My question/concerns:

1. Can I create another client ID 123-an0th3r.apps.googleusercontent.com and have both call the same API so that I now essentially have requests per 200 seconds per user?
2. Or is per user not tied to the client IDs, but instead, to the project id.
3. Could I create another project and re-route extra API calls to there?
4. Or must I throttle my querying so it stays within the limit.

Thanks!