It's possible to use rigs with different control bones (Like IK controllers and pole targets) by binding these bones to rig elements in Cascadeur. And the root constraint can help you with the root controllers.
The rig is available on Blender market: https://www.blendermarket.com/products/raptor-dinosaur-3d-model-realistic-and-rigged
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Timestamps:
0:00 - Intro
0:14 - The problem
1:25 - Export
3:18 - Rigging
7:45 - Bind control joints
11:17 - Fix root constraint
12:26 - Possible issues
14:10 - What about rigify?