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Are there generally accepted rules of around offering a draw or forcing a draw? 

It sometimes seems like 'not chess' when both players are just making moves as fast as possible when time is running out.  To me, it's gentlemanly for each player to accept a draw at that point. (I'm an 850 level player, a few extra points for me or my opponent means nothing). But it seems mostly to be refused.  Same question about obviously making repeating moves when down by a mile. (That maybe closer to fair play, because both players have to participate in the repeated moves -- I think).

Any insight into fair play rules would be appreciated.

Of course the algorithm permits it, so a player can do what he wants. I was wondering if there is a consensus about unwritten rules -- examples: golf, amateur wrestling, and baseball have unwritten rules about fair play -- for both the good of the game and the self-respect of the player. If I undersand you right, a win is a win, regardless. (I can see why this is the rule for serious players where wins mean something, but I'm not doing it).