Yeah that's something hard to overcome... (Or we have to pay lots of money to get a trusted certificate) I think I can improve it a bit though. I'll look into this.
By the way: just accept the certificate and you can access the site like normal
Yes, but the malicious pop-up will deter many folks. This is something that will have to be fixed. There are too many 'lesser' coins (not to bash any alt) which have perfectly accessible sites.