If it ever annoyed you that Zelda 3 chests can only be opened from the front (which sort of makes sense, but regardless) there is a simple two byte change you can do to eliminate this.

Go to offset $3B576 and change that byte and the following one to EA EA.

The instruction before this looks at $2F (Link's direction) and the instruction you're NOPing out branches if it's not up ( 0 = up, and it's using BNE). The other directions are down = 2, left = 4, right = 6.

So there you have it, Chrono Trigger/ Final Fantasy style chests using only two bytes.