ICT-SLB: I disagree. If ever you fly between an Imperial and Metric FIR, you really need the Switch or Knob. Pin or software programming is OK for switching between Knots and Kilometres, but a change in altitude measuring has to be capable of being done in the air (as well as on the ground) - so you HAVE to have the switch. Failure to provide the switch/knob means that any operator flying between these two types of FIR has to have additional paperwork.
PM