Control Speed in AltHold

Does anyone know how to control the speed in AltHold, similar to how you can control the speed in Loiter? Ideally, I would like to govern the drone so that it cannot fly faster than 1 m/s in AltHold.

There is no horizontal speed control in AltHold. Can’t be because there is no speed sensor (GPS, etc) in the loop

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How would this be different from Loiter mode?