Hi Jack,
Dont know of an airline that formally includes glide approaches to touchdown in the training syllabus. But most pilots get to have a go during spare training time at recurrrent SIM sessions. I have done it three or four times now, and like you say it's an excellent training exercise. The A320 is a beautiful glider and the SIM sideslips very nicely.
I would like to see a SIM with visuals suitable for practice ditching at sea with significant swell and wind. This would be a very challenging exercise.
And wouldn't it be nice if Airbus would hot-wire the left landing light to the batteries so that if someone does ditch at sea at night with nothing but the RAT for emergency electrical power he might have a chance in hell of pulling it off. In this situation the radar altimeters are lost, at best we would have area QNH, and the only external light is the crew torch through the window. Airbus should revisit the design.
Cheers