I've got another trick to use in place of a Magsafe type cable. Get a cable that is a few feet longer than you need, and attach a couple magnets a few feet apart on the cable. Then click the magnets together. Now you have a cable with a loop that is held closed by the magnets. If someone trips over the cable, the magnets come apart and pull out slack from that loop, instead of pulling the cord on the back of the laptop.

Not quite as good as having the cord detach, but it still helps in the majority of minor trip-induced cord pulls (depending on how much clack in the cable you leave bundled between the two magnets).