Concerning SXC pool: I am wondering how Are you going to handle those random x3 and x50 blocks?

Good question, I hadn't thought about it.
First it would be nice to make such blocks
visible in stats, and as for splitting the income maybe some additional incentive to the lucky one who has found it? Just a thought

Yeah, the code doesn't really support splitting the extra income, so I'd have to make some changes to support that. It would be fairly easy to highlight those blocks and provide a bonus to the finders, though. I'll look into that.