Well, I'd create a new thread for Lemming games, I prefer doing it this way so I could get the credibility as someone like Larry Kauffman amongst non commercial engine authors.
I don't think anyone will have a problem with a single thread full of stuffs about lemming, as long as I don't borrow anti-computer style like Pablo and post them.
In case, If you would prefer this via email, I could do it. I've started playing few games, saving the games to be mailed.
No problem about asking me questions or comments on feedback, Feel free to ask me anything, I will try to answer.
Nc6: Usually happens in the beginning during the development, many engines make similar such moves. Suggest the better alternatives such as big book. If not, try to fix this out and do more tests to see if it does really worse. I don't know if fixing this would hinder the development in the later stage of the game, looks like this is likely the case.
0-0: Yes, you are right. Ofcourse, King belongs on the kingside.
g6: Yes, fixing this would really help. King side attacks generally often happen in higher level games.
This is the basic in positional chess. Support the pawn cover of the king first, then do something else. Otherwise, it messes up the pawn structure in what is considered the important location.
19...Rd8 : I have some 10 problems in beta test suite related especially on open files and diagonals. When I get back home, I will test the engine on this.