but can I request the officer over at the port of entry to allow me to grant I-94 for 4 months
No, you may not.
I think its 30 days generally. Once you're on B1, they expect you to have specific dates with respect to your business conference/meeting etc. Give and take a few days. But surely you cant negotiate with the INS officer at the port of entry. Frankly, you need to have some solid paper work if you plan to stay for 4 months on B1. Why would a business person leave their business in India or elsewhere and stay in USA for 4 months