Peasants leaving because of high taxes? Not anymore. This locks your Lord's popularity at 100. Your castles will fill with citizens instantly, accelerating your production chains.
Stronghold Crusader Extreme is notorious for its difficulty spikes, often throwing thousands of enemies at the player in "Skirmish Trails" or the Extreme Campaign.
Because game trainers exist in a legal gray area (they violate the EULA but are not piracy), you generally won't find them on the Steam Workshop or GOG.