Minimum toast size should be a square.
Fix reversed KEY_NAMES entry for F1-F12.
Use yT proxy for execute function, which also propagates return value.
The return value of executing a command string should be the return value of the last command executed.
Bind document elements with data-yuu-command attributes to command execution, depending on their type. Prefill them when showing them.
Replace placeholder pwl6 about/options with something slightly functional. Provide several (hopefully game-neutral) default CSS rules for screens like this.
Add director to lint list.