Personally I find the time zone issue to be a real pain, and would also love to have a go-to place to find people who don't want to play at 2 AM during the week. That being said it is not about regions, but time, so the group should be allowing anybody willing to play in what can be considered reasonable hours for the old continent. If there is something that could facilitate communications with such people already, I will be very happy if somebody could point me in the right direction. I saw groups for other time zones and specific systems both, but nothing useful to me, unfortunately.
