Thank you for the report, catalinberta@.

The closest thing we have right now on Canary is either holding Shift+dragging the 3D model (rotates along just y-axis) or scrolling inside the input.

To help us better understand, could you please explain how sliders would support your use case?  Do you care about being able to set precise numbers for alpha/beta/gamma?  Have you used the dropdown list of preset orientations?  Those presets put the phone in orientations with angles that are multiples of 90.

You also mentioned using device orientation for testing.  Would you benefit from being able to save and replay transitions between two fixed orientations?

Thank you for the prompt reply.

Good to know about the Shift+Dragging shortcut, it will come in handy!

Maybe this is a bad reference, but in the Unity Inspector UI for example, if you hold click on the field labels and drag left to right, you increase and decrease the values of its field conveniently and fast.
While I reckon that the Chrome UI does not have such functionality, maybe some regular fixed sliders from 0 to 360 would also suffice (though infinite dragging would really hit the spot where you can drag to keep looping full rotations).

Use case:
I create mobile creatives and whenever I also implement device orientation, I need to test how it behaves when only the alpha axis is updated, or gamma or beta.
My last case scenario was testing the gamma axis (z-axis I believe), and dragging the phone model only on the Z axis from the Chrome Inspector was painful.

Regarding the idea of saving and replaying custom transitions and values sounds phenomenal, as it will make testing much easier.
This would help me (and many I hope) to create a use-case and repeat until satisfied with the results.

Making the labels draggable (similar to Unity, Sketch, and a few other apps) is something we can look into. It's a pretty undiscoverable interaction, but if it could be generalized easily throughout the product (similar to the arrow key behavior), we could add it for special use cases like these.