SpiderMonkey
Explorer
I've looked and I can't find it: is there a rule that affects a PC who tries to throw a dagger while climbing?
Based on what I've seen some climbers do, I'd let it happen but it's going to give some hefty penalties on your climb checks.There's nothing beyond what's already in the Athletics skill.
I would rule that you need at least one free hand to Athletics/climb.
So, climbing partway up a wall and then throwing a dagger from one hand seems fine. Climbing partway up a wall and then swinging with your fullblade is not.
Yeah, that's a tough one. The dice will be down on the ground and you will be up on the wall somewhere. You might consider using a telescope or binoculars slung from your neck with a lanyard so that you can raise it to your eyes one-handed.