A state senate committee and the senate president pro tem chose a San Francisco supervisor to replace Steve Kinsey on the California Coastal Commission, the 12-member entity that regulates development along 1,100 miles of shoreline. Aaron Peskin, who comes with a long background in environmental work, started his position yesterday at the commission’s meeting in Ventura, when he was sworn in. Before that meeting, he spent a day reviewing 800 pages of material. “I think…