Okay, so you just went ahead and launched a token with 18 decimals? So there are 4000000000000.000000000000000000 coins? What are we going to do with all those decimal/fractional units? And, better yet, we won't even be able to trade at 1 satoshi or even 1 litoshi with 4 trillion coins outstanding. Fucking hell

I outlined how we could have 40k - 1mil coins outstanding and a 1:1 relationship for any decimal units.
Seems loaf has the utmost faith or why else would he push so hard for an asset that depended on PJ to help with the implementation, right?
Anyway...you won the darkside award with your well timed post ;P
I push hard for an asset as it is fucking stupid to be running a crypto game without a crypto token. Anyway, I have zero faith in PJ and think he has been massively overpaid for the quantity (i.e., minimal) as well as quality (i.e., horseshit) of development he has done. But since everyone raided the game for XMR and doesn't want to try to raise funds or hunt for a new developer, it looks like we just have Stockholm Syndrome and will keep using this same piss developer.
Do the extra decimal places have any negative effects?
The decimal places maybe not, they can just be rounded down and people told not to deposit fractional amounts or they'll be lost (can be kept by the treasurer or donated to Town). The huge supply could be an issue as he pointed out, because the price on exchanges will be extremely low. That makes it difficult to trade when the spread is between 0.00000001 and 0.00000002 or even 0.00000000 to 0.00000001. In the former case the spread is enormous in percentage terms and in the latter case there is no bid because no one is willing to pay even one satoshi for a single M.
Another coin with a similar issue (Dashcoin; not Dash) but with not even as large a supply went with a 10000-1 reverse split specifically for this reason.
I would go for at least 1 quadrillion M with 1 "satoshi" = 1 M. So that is 1000000.00000000 or, with commas, 1,000,000,0.00,000,000. This way you don't have to worry about the decimal values being "lost" and also with 1mil "full" coins, you have a decent level of scarcity where you may be able to trade at a reasonable level. You could even go into the tens or hundreds of millions in "full" coins if needed and still be okay, but then you are talking about tens or hundreds of quadrillions of in-game currency.
Like I have absolutely no idea about this coin, but just was glancing on the top 100 of CMC for something I didn't know. NoLimitCoin:
https://coinmarketcap.com/currencies/nolimitcoin/#markets. 200mil outstanding, $35mil market cap, and roughly $0.17 per coin value. If we went with the same amount of coins, that is only 20,000,000,0.00,000,000 or 20 quadrillion currency units. Not saying 20 quadrillion is the place to be, but it is just an example and honestly the number of coins outstanding should be discussed.