Multi-step forms - feature request - Configurable 'update' button

It would be very helpful if not on the add but the update button could have the option of being disabled / hidden for the multi-step form.

I have a form that needs exactly this approach, but need to be applied to an existing record so needs to use update when completed - annoyingly it isn’t possible to supress the button until all ages have been worked through.

Hopefully adding this control on (since already written for add) should be easy?