According to the DAO decision, Instant governance functionality has been deprecated in the V2 Staking protocol. Nevertheless, any MMT Swap staker can make proposals for parameter changes on the Governance Forum and vote for them on Snapshot.
The Swap Surplus is the difference between the swap price at the time of the quote and that at the time that the transaction is mined. It occurs in swap transactions when the executed price is slightly better than the price quoted. Read more.