There were talks long ago about Ame replacing Hoshi. It happened on the test server, but even then, there were some difficulties in getting a few things to work entirely correctly before transitioning it to the live server. I had suggested public clan halls sometime ago, but I don't know where that topic went.
Although it's not an issue of favoritism, but rather convenience. But they can be interchangeable or used together. Oto went from a super secret place, to being public and easily reachable via travel or using the gypsy tent. This was all by public demand, since so many people had wanted to access Oto through easier means. It was probably more than easy enough to do though. I'm sure that if there was a big enough demand, we could probably get a very simple thing for Amegakure, even if it didn't really fulfill any in-game purpose other than to waste travels.
But I'm fine with Ame as it is. It actually requires people to enter the clan with either their main account or their alts. This also gives me an exact number of foreigners who enter, and it would have to be done by RP. If somebody were to do something stupid or doesn't make sense at all, then I can simply boot the person. I have the most control over my village than others do with their own, when it comes right down to it. That's something that most people can say they don't have. And that fits perfectly with the whole security motif that I have running.
But that doesn't mean that I wouldn't like an Ame board. I'm fine either way.