[Truper]

Sure, roleplaying a powergamer; that's the spirit!

[tease mode off]

All that may be needed is to encourage roleplaying and a bit of creative writing. Another idea might be to adopt a diplomatic idea that has come up in history on a number of occasions: "Open Covenants Openly Arrived At." That is, diplomacy is allowed, and encouraged, and encouraged to be in character, but can only be conducted through through the game's thread, not through in-game messages or email.