I think topics of that nature would fit in the Off-Season Recreation forum. If you want to talk about other sports go for it, but if we wanted to start making compartments specifically for other activities/sports we'd lose the snowboarding niche.
What Kirkrider is talking about is the parent host of this site which is Vertical Sports. Snowboardingforum is just one of many online communities of the site. I also moderate on the ski forum (although it is deader than a beaver hat.
Kirkrider, your best option is to contact vertical sports directly and ask about starting a rock climbing forum...
2015/16 -9- Kirkwood days
Arbor A-Frame 158 2009-10
Jeremy Jones Hovercraft 156, 2011/12
Subaru WRX 06