Development access in SAP

Hi, I have 2 questions:

1) Is my understanding correct that if a user has been assigned a development key (per table DEVACCESS), the user will be able to implement transports in the SAP Production environment?

2) If so, if SE06 is set to "Not modifiable" to prevent changes and development from being made directly in PR, would this also prevent the user (in 1) with DEVACCESS from making changes directly in PR?

Thanks.