As a player who likes to try different strategies, I would feel more comfortable if I could use a different name each game. I worry about players I've attacked (or even betrayed) in one game having a vendetta out for me in future games because they assume I will be agressive again. Some times I like to play a trustworthy Trader ally. Other times I want to be a cuthroat Warlord. But I know that I'll be forever carry a mark once enough players associate my name with something bad from a game long over.