In Porikos found a camp with centaurs with option to hire them but hire options are greyed out. Actually I'm not sure what kind of hire it is. If they're hired like mercenaries, I suppose it is the bug, as I have enough of resources. But if it is permanent hiring it's OK as I have max supply limit. ...

Actually straight rushing is less profitable then exploring. As one wealth costs 25 gold, ending even with 10 turns left provides you 250 gold, but exploring only one ruin may provide you nearly 100 gold and there are plenty of ruins. At first I thought wealth is some limitation, like ending on gold...

Obtained two bows with ridiculously big numbers.
This buff works - game freezes for a few seconds while trying to calculate area of attack and then lets to attack units much more further then it should be.
No special exploits are used, eg. Cheat Engine or smth.