The "check target" parameter for the auto-block commands can now be set to 2, 1, or 0 (instead of just 1 or 0). If 2, only mobs directly targeting you will trigger the command. This can only be used with mobs. For players (PvP), there is no change, and you should use 1 as before (or 0 if you know what you're doing).
I've updated the guide text for all the auto-block commands.
This change requires Speeder version 188+.