I’m a big board game geek, that’s no surprise to most. This means that I often come across cases of ‘variations’ or ‘house rules’. By and by, I support the idea. Many pople do. think about when you play Monopoly. What house rules do you use? That said, most games have undergone a lot of playtesting, and the rules are well worked out; so don’t change the rules so much that you are playing a different game. Actually, one should always be careful when using variants or house rules that everyone playing agrees to them, or else it borders on unfaur and unethical play (not quite as bad as cheating). If going overboard helps illustrate the point, see http://www.theonion.com/content/node/40779&rss=1 .
Oh, and if you’re curious about Ethics and Gaming, go read the articles on it over at http://www.thegamesjournal.com/