can partial credit be earned?

Our project is an expansion to a facility that hosts events/conferences in addition to its normal use as a lab facility, and while daily use would not require all the parking necessary by code, the events would overload parking if designed to code. The jurisdiction that the project is in does not allow parking on unpaved surfaces, so parking on grass for the events would not be allowed. Also the owner already has agreements with neighboring lots to use their parking for big events but these lots are saturated as well when they have the large events. As such the owner would like more spaces than code requires so they have enough parking when large events occur. Is partial credit (just one point instead of 2) achievable for providing the required carpool/vanpool spaces, or is the credit all-or-nothing? Or, if more than 5% of spaces are designated as preferred, would this help compensate for not having less parking? Are there any other ways to meet the intent and achieve the credit? Thanks