Unfortunately there is no testing with webcam available for the snapdragon spaces sdk. 

While you can not test perception features such as anchors, or plane detection in the editor, you can use XRIT device simulation for hand tracking. Take a look at the instructions: 

https://docs.spaces.qualcomm.com/unity/handtracking/BasicSceneSetup.html#in-editor-simulation

https://docs.unity3d.com/Packages/com.unity.xr.interaction.toolkit@2.0/manual/xr-device-simulator.html 

We do have plans for a host simulator on windows with Unity and Unreal engine. Feel free to upvote it on our public roadmap: https://portal.productboard.com/bdx5dufjd6ka3jnwpbqldqmu/c/29-pc-host-simulator-for-unity?utm_medium=social&utm_source=portal_share 

Can you specify what the RealSense camera would be used for - Editor testing or in combination with a Snapdragon Spaces device?

Using RealSense or any depth camera is currently not possible. 

I would need to file a feature request for it. Could you give some more details:

• How would you profit from a RealSense over a normal webcam?
• Would you use the camera for testing in the Unity editor or does it have some other purpose as well?