I would like the inclusion of alternatives for the same achievements. So we wouldn't have the cripple for every monarch injuried 5 times in battle. Alternatives such as "The Scarred", "the Fighter", "the Bold", "the Brave", would make sure the world wouldn't be filled with monarchs called "the Crippled." or filled with "The Pious"
Works for me!
Nicknames like 'the conquerer' are hard to get, as you get a nickname as a young man (remember, William was 'the bastard' before he was 'the conquerer'). An event might change a nickname at some point after one becomes king...
I wouldn't mind seeing monarchs nicknames changing if they do get something else. If they record it in the automated AAR, it could read something like "He was known as William the Bastard, and William the Conquerer". Something simple like that works for me.