Looks at my build...best I can do is a lvl 10 zen-archer. If I hit a wall on some optional boss, or see that it's getting too hard, I'll look in to multiclassing. The issue for me is that if I wanted to multiclass I would have to look at all the classes and figure out what combinations are good, I don't have the prerequisite pathfinder/d&d knowledge. I could also look at some builds, but that kind of defeats the purpose of the game for me (like auto leveling). At this point it's on the border of being fun while not going overboard with the builds.
Saying all that I still love hearing all of your suggestions and will probably try to go for some broken builds on my second playthrough, if I ever do one (maybe even in this one).