allow any blocked elements

Currently you can configure blocked HTML elements, per input format. You enter only HTML-ish tag elements and angle brackets are added as needed to form opening and closing tags.

The problem is that some other filters use square brackets for tags, and there is no way to define blockers for those. For example, [code and [codefilter_ are hardcoded.

Not sure what the best solution would be here. Maybe another textarea just for square bracket tags? Or something more generic that allows you to specify any open/close pair?

How about regular expressions? You could have one per line in a textarea.