I always go straight battery to battery connection, in fact I had to exterior start our 3200 this morning and used our made for the job charger with start facility, all was fine.
Must admit I fail to see why it could be a problem. Definitely should never be any issues with using a booster battery, it's only like replacing the car battery. And provided you get a good connection from the other car, i.e. battery to battery I fail to see why that should cause a problem either. Anyone ever found a link that gives a reason?