I haven't. If he's blatantly tanking(players out of position, pitchers at 0, etc, etc), you can report it to WifS. They'll send him a warning. That's about it other than don't join bad worlds.
http://www.whatifsports.com/forums/Posts.aspx?TopicID=455110&Page=1 They're all still relevant. In addition, a couple of bells/whistles would be nice.
1. Logo/color options. Purely cosmetic but I think the current customer base would get a warm fuzzy over it.
2. World size options. I believe HBD is dying. As has been discussed ad nauseam, I don't think there are thousands of people out there dying to play a game like HBD. So customer retention takes on a new importance while new owners trickle, not flood, to the website. Virtually no one likes to merge. So having the option to reduce world size seems to be the best option.