I wouldn't mind having a hearing dog... my lab (RIP) use to alert me to sounds, like someone nocking on my door, my nephew crying, people saying my name when my back was turned, and other things. I didn't train her, she just instinctively knew what to do. I have only met one other animal, who I wanted to take home but couldn't, who would do the same thing for me... he would nudge me when the bell at work went off or if someone walked in without it going off. His current owner said I could have him, but I can only have two animals at my apartment complex. I watch him on a regular basis, and love him to pieces... I would love to have another dog that would do those things for me, because it would give me a lot more confidence walking around on my own.
Also when I was younger my family wouldn't let there be any sign that I couldn't hear in the house... no flashing lights, nothing... and living in an apartment complex, the only "accommodation" that I have right now is a smoke detector that flashes... without my HA's on (which is most of the time at home) I have no clue if someone is at the door or anything... unless my SO is home.