Extra Social Dice aren't even clear whether they're meant to happen. Which kinda makes it hard to figure out if Street Cred is supposed to boost your Negotiation Test dicepools in Missions. I hope not, because it'd make Negotiation Tests bloat way too easily: 6 Charisma, 6 Negotiation, 6 Street Cred, 6+ Teamwork Hits (easy if the teammates also have +SC dice) means 3 hits more than the Johnson on average even before Edge, and Runners love using Edge on Negotiation Tests.