It has been many moons since I flew the MU2 and I never had the benefit of simulator on that type, so I will defer to those with greater experience on type.
My point is that some manufacturers of light turbines recommend rotation speeds that are sometimes implied to be equal to a V1, when in fact they are such thing. In fact using the term Vr is something of a misnomer too, as by definition Vr can only be equal to, or greater than V1.
The MU2 was touted as being semi STOL, rough field capable and was indeed a good bush aeroplane in the right hands, but the big split between recommended ‘unstick’ or Vlof (more appropriate terms?) and blue line meant there was a short period when you could be airborne but seriously compromised if an engine failed.