We have had people joining our outfit having never being allowed to touch the throttles so no taxiing doesn't surprise me. As alluded to above it makes you wonder what will eventuate should the capt become incapacitated one day. The only restrictions we have are a x-wind limitation on landing for newbies and the skipper will always do a Cat II or III landing. Having said that we get some sim time to do low viz stuff just in case you end up being single pilot and need to get back in from your departure airfield.