Yes, you can use mouse and keyboard in Dragon Age: The Veilguard on the PS5, but there are some limitations and considerations to be aware of:

1. Hardware Compatibility: The PS5 can recognize and register both the mouse and keyboard, but the game may not support their use directly.

2. Game Support: The game does not natively support mouse and keyboard input on the PS5. This means that even though the hardware is recognized, the game may not utilize the mouse and keyboard for control.

3. Alternative Solutions: If you want to use a mouse and keyboard, you might need to consider using a different platform like PC, where the game is fully compatible with these input methods. On PC, you can seamlessly switch between mouse and keyboard or controller at any time.

In summary, while the PS5 can recognize mouse and keyboard hardware, the game does not currently support their use for gameplay. For optimal control and compatibility, playing on PC is recommended.