Modifying X-Modifiers

lf11 writes, "I have a problem, for which I have been unable to find any applicable documentation. I am trying to bind a combination of keys to produce one character in X-Windows. In this case, I'm trying to bind Alt + Shift + j/k/l/i to function as arrow keys. I don't know if it's an Enlightenment function ("__ACTION __KEY Left" segfaulted) or an X function."