Nice. There is a vulnerability in motocoin that can be exploited by a bot owner to easily make a blockchain fork. Anyway this is too risky to invest money in this coin unless they close the bug.
How do you propose to fix that bug? You can't just decrease target time if there were no maps that were completed in time less than new target time because you may just accidently decrease it to a point when it becomes unachievable.
We are already very far from original satoshi idea... so I propose to use a floating threshold. If no one is able to find a block in 2 mins then threshold will be increased. Or better say that new block threshold should be somehow linked not only to the previous 2000 blocks and separation between them but also to separation between this block and previous. It is hardly to find any hole in there... looks fine to me at first sight. It may introduce some kind of oscillation but I do not see any big flaw that can be used in attack. If you are issuing new block in just one second then your solution shall be shorter than say 5 second. If you are issuing next block after a five minute of game than your solution can be very slow and not optimal.