Turbo Props
I suppose this is overkill at this point....but just as a point of interest....on 2 turboprop types I have flown (note: No Autothrottles!), use of IAS HOLD was prohibited during any approach segment, and allowed only with caution below between 10000-5000'AGL....for the same reasons as mentioned already...extreme rates of descent and nose down pitch attitudes, which of course can be more acute on a turboprop due to the very high drag at flt idle.