Roll fed instead single sheet in standard A4 laser

dear All,
have you had never exp on Roll fed for A4 laser printer?

My problem is as follow.
I have a laser printer A4, driver OEM in PS3 is avaialble.
Roll Fed Option (in custom page PS3) is Ghosted (Greyed Out).

I suppose the command is:
[b*NonUIOrderDependency: 310 AnySetup *CustomPageSize
>
> *CustomPageSize True: "
>
> pop pop pop
>
> <<
>
> /DeferredMediaSelection true
>
> /PageSize [ 7 -2 roll ]
>
> /ImagingBBox null
>
>
>
> >> setpagedevice
>
> "
>
> *End
[/b]
But I am not sure what is parameter/command to active the function (no standard in the printer obiusly)

Thank you in advance for any opinion
Best regards
Piras