1.) Are future improvements included in the price?
Yes.All future updates are included in the price.
2.) How often do you need to fine-tune the settings for currency pairs/other settings? Hourly? Daily? Weekly? Monthly?
It all depends on the market conditions.For example if you observe a downtrend on BTC/ETH you may want to disable the ETH pairs to avoid generating ETH in the bank, because it will lose value compared to BTC and you will have to use more BTC to average the ETH bank.
But keep in mind that amount is added to the bank only when there was unfilled order, so if you dont have unfilled amounts when BTC/ETH is going down you may prefer to leave it enabled.
3.) Some logs are showing only a few trades per day. How often does that happen and why?
It depends on the difference between price spread on the used pairs.
For more information how the price is formed you can check those links:
http://www.investopedia.com/terms/m/marketmaker.asphttp://www.investopedia.com/terms/b/bid-askspread.asp