Path Message with Velocity?

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I know I can create a custom message that includes a velocity with each pose, but I'm curious for input from other developers. Is there a reason it would be detrimental to carry a speed command in nav_msgs/Path?

For context, I've got a machine that's non-holnomic and I've created a path plan. The machine is capable of high speed (20 m/s). As a part of that path following I want to determine safe speeds to avoid mishaps. This requires looking at stopping distances, safe cornering speeds, etc.

I was thinking to add geometry_msgs/Twist velocities to nav_msgs/Path, maybe call it PathWithSpeed? PathWithTwist?

Am I alone in thinking this would be a helpful standard message? Or have I totally missed some other method that would serve this purpose?