Just to add a bit of context — PunBB was originally designed to stay minimal and lightweight, which is why it ships with plain text + BBCode by default.

Technically, integrating a WYSIWYG editor (like SCEditor or TinyMCE) is possible, but it usually requires:

Overriding the textarea in post.php

Making sure the editor outputs clean BBCode (not raw HTML)

Handling proper sanitization to avoid security issues

Most historical implementations wrapped a BBCode-aware editor rather than enabling full HTML editing, to preserve PunBB’s simplicity and safety model.

If you’re open to forks, some modern variants (e.g., ForkBB) have more flexibility and might make this easier.

That said, adding a full WYSIWYG editor slightly goes against the “lightweight” philosophy of PunBB — so it depends whether you prioritize usability or minimalism

Thanks.