It's a good question. I have been experiencing a bug when several address had been created, but some of them haven't been shown up in "Receive coins" tab. It caused a problem in sending big coin amounts (>100K) and I finally decided to move all coins to one address, dump its private key, create new wallet and import the key. It worked nice, but the wallet still continues creating multiple addresses with small coin amounts in them: 0.0286, 0.021174 and so on. I tie this issue to POS blocks generation, that's why some code investigation is surely needed.

Yes, DopeCoin code is based on PPCoin code.