I have found what I’ve been looking for in OS X and it’s name is bindkey. It’s unfortunate that Apple hasn’t deigned to include any documentation about it, but I finally stumbled on an OS X Hint that let me put 2 and 2 together. I was searching for this functionality earlier and couldn’t figure it out. OS X’s terminal is actually usable now.
bindkey -k delete backward-delete-char
NM, that’s not right. I’m close though…