really.................. so... you screw with the difficulty to you can try to make a CPU mineable scrypt coin..... THEN... the chain doesn't form a chain because the difficulty of the blocks being solved is too low and causing it to throw an error...........................you have no idea what you are doing.. all you had to do was change the amount it will vary during a diff reorg. ... and change the frequency it will reorg the diff from every n blocks to every block...... OR stop screwing with it to try and gain an advantage
bug is bug. but you are criticizing the coin design high level. Nengcoin original design was 80:20 split between ASIC miners and CPU miners, ASIC miners (including USB ASIC) get 80% of all block reward, CPU miners (PC + android) get 20%. v1.9.x with new security upgrade will change the split, but intention of dev team is always to insure that majority of block reward goes to ASIC miners (including scrypt USB ASIC in this group).
NENG has more than 3 years of history, CPU mining for nearly 3 years, mobile mining on Android for more than 1 year. So this is not what you think. The coin is working fine. Sure bug causing syncing issue was serious issue, but the patch fixed this.