beneficiary "rights" after new RMD regs

[Guest gregoryp]

Scenario: QP plan participant dies and names son as sole beneficiary. Son begins taking RMD's according to his life expectancy within appropriate time frame. Can Son now change investment elections in the plan to reflect his risk profile? If a 403(B) account, could Son do a 90-24 and transfer assets to another contract? Basically, what are the beneficiary's "rights" or limits to their control?