Shortcuts can't be constructed for Mac option-arrow key combinations (option+RIGHT, option+DOWN, etc.).
These would presumably be M+RIGHT, M+DOWN, etc. as the option shows up as M+ with other keys.
Mac option-arrow key combinations move the cursor a word at a time in most jEdit contexts ("Search and Replace" windows, incremental search bar, Console plugin, etc.) and other Mac applications, so it would be great if they could be shortcuts for the corresponding jEdit commands like Go To Next Word.