Magic Keyboard for iPad Pro

To my knowledge, you can't turn trackpad completely off, but unfortunately I do not have a Magic Keyboard, so I can't perform further tests.

You can submit your request/suggestion to Apple directly, using this link:--> Apple – Product Feedback

Regards

Giulio

Start here:--> Set up and use Magic Keyboard for iPad - Apple Support

and/or here:--> Change trackpad settings on iPad - Apple Support

Regards

Giulio