1. This thread is not about the proof-of-work confirmation mining idea itself (as the linked thread) but about implementing it on bitcointalk forum.
2. Yes, there should be option to complete CAPTCHA instead of mining for weak hardware. Yes, 1 minute confirmation mining is too long, this difficulty should be set only if there is DDOS/bruteforcer activity spike. Usually confirmation mining should take no more than a few seconds.
Also, you'd just get people putting more cpu power behind these attacks. AND, you get that ddos isn't don't by pepole logging in right? It's just a large amount of network traffic, they're not all trying to login.
If you're gonig to try to get everyone's login data, that is mainly something that is done offline (obviously not going into specifics).
Yes, but there is CAPTCHA on login/sign up. The question is about giving an option of proof-of-work mining confirmation instead of completing it.
It will not only get more CPU power for attacks. It will make attackers mine coins for the forum!!!