Unless I'm blind, I don't think it's something that is already implemented. Could you add a shortcut button to add/wrap selection in base64 bbcode? For example like how highlight shortcut in "More options" submenu works.
Also while writing this post it would seem just having an opening [base64 ] tag without a closing tag converts everything after it into bb code. Just an observation in case it's something worth fixing.
Also while writing this post it would seem just having an opening [base64 ] tag without a closing tag converts everything after it into bb code. Just an observation in case it's something worth fixing.