Zoom 1/???xp

Is there a way to replicate AutoCAD's 'ZOOM 1/50xp' (etc.) in Draftsight? It's specifically the 1/50 bit that Draftsight doesn't seem to recognise. Typing 'ZOOM 0.02xp' works (as do other scales typed this way) but the AutoCAD method was rather more intuitive. Is it that Draftsight lacks the ability to allow mathematical functions in command line operations?

Thanks!
Chris

 

EDIT: Just noticed I'd requested guidance on completely the wrong command when I first posted this - it's the Zoom command I should have asked about, not Scale