This has been confirmed by some members (namely Marvin and Glenn on Discord ) that the scamiq team will mine with vested accounts worth almost 1.5 billion coins (30% of existing coins right now).

in case you missed it, the answer if the vesting accounts can participate in staking is already in the Albatross paper: "Staking: When nodes want to become validators, they must send a staking transaction. [...]The result of the staking transaction is to transfer the desired amount of tokens from the node’s account to a special lock account and adding his validating key to an on-chain registryof potential validators." Vested funds cannot be transferred, so they also can't be transferred to the lock account for staking.