I don't think three challenges is too hectic. In my experience, the only ones that are particularly time consuming are the month-long ones. There's typically 15 days to get the others done, and if someone doesn't have the time, they could just... ignore any of them they think will take up too much time. I kind of considered many of the mini-games as the "light-weight" challenges, even if they're not voting challenges. Let's just pretend like this makes sense.

I don't really have an opinion on the mod's choice, as I can see about an equal amount of positives and negatives for that. So long as it's a small amount of points, I don't think anyone would object though.

The rumble type of competition sounds entertaining!