Please add option to disable autosubmit per site

It is a small site for hobby enthusiasts, and I'm not comfortable sharing URL publicly. If you can reach me by email I'll do that.

It is a custom forum. To post you have to put your nick, message and secret code (kind of password), and then push post button. 1Password treats nick/secret code as login and password, so if I use autofill before I put the message in, 1Password 'clicks' the post button and in effect posts empty message.