I see. so basically your looking at it from the cautious perspective of why take a chance and it's a easy change on your end to avoid that small chance of issues with the real IMDb.
To be honest, I haven't even thought about it in three years. Apparently that was my perspective then, and now that I'm thinking about it again, I can safely say that it still is. It was probably never a big deal, and probably even less of one now that the forum's layout is so far removed from what it was - back when it was an exact copy of IMDb's General Message Boards.
Have you any practical arguments against that easy change?
If you aren't sure if your post will violate the ToS, just don't post it. Err on the side of caution and this forum will live a long and happy life.