as hinted previously, and as a response to SandLover's request: we can, and are happy to start worlds on different settings. Actually, we have over a hundred parameters to set for each world, so there are plenty of room for tweaking (and for game balance to.... well, get inbalanced) so we are prepared to do it. For that, all we need is a lot of input from our community.
So here's an exploit with the way population happiness works and an idea I have how to fix it.
Currently you can lower your taxes so that your population's happiness goes up to 100% . Then you just up your taxes to normal and the happiness stays at 100% indefinitely, unless you increase taxes again.
Here's 2 ways I think this system can be improved:
No way to change build order - problematic as tax changes are on the central hex I cant force a tax change while waiting for a city to finish building without cancelling the build. Tax changes etc imo should not be tied to a hex.