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.
(Edit: removed poorly worded and distracting junk. I'll try to better convey what I meant later, after more pressing matters are handled.)
Another approach would be to do something along the lines of a gravity well, or to introduce a small difficulty-reduction-over-time-by-default. (When multi-pools started destroying chains inadvertently these solutions became popular to keep chains from stalling out. I think this particular conundrum is similar.)