Multisig address for website?
Are you saying it's difficult because the user would have to sign their own transaction manually? P2SH isn't really at a "typical" user level. For multisig to work as it's intended to, it assumes each potential signor knows how to sign a transaction. A website that would require it's users to sign their own P2SH transactions would have a pretty small target audience. Aside from building your own native desktop app that makes multisig signing easy for the average user, I'm not sure what other options you would have.