Auto-translated
Well, you could simply avoid mentioning that Loghain will betray the king, and then he can be recruited into your own army. Or that the gray warden who killed the Archdemon also loses his life unless he has some fun with a swamp prostitute. Or that Alistair is the heir to the throne. Or that Isabella stole the relic, or that Meredith is the main boss of the second part.