>There is no OO-way to do this, but it still possible:

>report form myreport preview nowait
>move window "Print Preview" to 20,40
>mouse click at 22,70
>keyboard '{DNARROW}'  && 75%
>keyboard '{DNARROW}'  && 50%
>keyboard '{ENTER}'

So why didn't you suggest this when I asked the other day? :-)