I don't have a problem with a more humane way of killing them. The boiled alive part is something that always bothered me. I find it very hard to believe that the lobster cannot feel any pain.
I have seen them crawling along the ocean floor missing parts and still behaving like any lobster. Big tropical fish can be seen minus their tails (probably due to the lobsters), still swimming in a lurching manner. While I suppose the crippled ones get eaten sooner by other predators, they don't writhe in agony.
As someone said earlier in the thread: I have yet to find any nervous tissue in lobsters, shrimp, prawns or crab. They are not human or even mammalian. They are simply tasty aquatic bugs.
The problem with have is empathizing with crustaceans and fish, assuming they are the same as us. They aren't.