I wish there were more JW's resisting the extreme elements within the religion. I beleive there are many who know some of the things they hear and read are whack, but stay because they think it's still the group God has chosen. But there are ways to voice your opinion without being too vocal or disassociating:
If your congregation is too strict or giving you a hard time, find a more liberal congregation and move there. If there is not a more liberal congregation, at least the move might get the heat of your back and you can remain more annonymous in your new congregation.
If you hear something really extreme or not quite Christian-like at an assembly, don't clap. It may not sound like a big deal, but if 1 out of every 4 in the audience did that, it would send a powerful message.
Don't donate for literature that is extreme or hate-filled.
If you have very close friends, slowly and carefully talk to them about the extremist and hateful viewpoints. They idea is not to get them out, but rather let them (and yourself) know that you feel that way. Create a support network within and slowly spread the message.
The change has to come from within, and the change has to come from the grassroots level.