Well, lying is evil, no?
That is unfortunately common problem whenever RPG tries to "judge" players actions. As it is I am everyonce in a while irritated that companions take at face value stuff I say as a PC.
I think in D&D ethics, lying is considered chaotic (or at least non-lawful) but not necessarily evil. But definitely I agree both that if the game was going to recognise and respond to your alignment then it would be essential for it to allow us to make clear when we were lying or not, and that that’s something it really should do anyway.
