In our outfit the FOs carry out an RTO during each sim check. Due to only Capts handling the thrust levers on takeoff, it's always based on Capt incapacitation (not necessarily obviously slumped over the controls) to simulate a realistic scenario that just might happen in the real world. Strangely, the FOs don't appear to have any difficulty in closing the TLs, selecting reverse and stopping the a/c. Probably because they're good professional pilots.