BEagle, in Loganair we use a 'CDA' (Company Decision Altitude) during non precision approaches, which is simply MDA + 50'. Bugs are set with reference to that and the go-around is flown immediately if not visual at CDA. No level segment as mentioned since we couldn't land safely from much above the glideslope and that's just a Saab 340. I can't imagine bigger aircraft could manage it either although that is during passenger carrying ops. It might be fun to try though
.