I think you’d have to make a custom device type to control parameter 0x7D (125) to set default dimming rate.
They don’t make it easy.
EDIT- well this tool is kinda fascinating and maybe it becomes easy. I haven’t tried it yet. I think you’d change the target device, to this below device-type ZwaveTweaker, then tweak the parameters and press configure, then change the target devices back to the desired/original device-type.