Felli Yeah, but my reluctance to play with extensions comes from the PhpBB world, where the extension developer is always chasing the PhpBB dev team's changes as even sub-versions of the board software break extensions all the freaking time.
Often times, the extension dev gives up and leaves you in a hard place without an update. This happened with a CKeditor plugin for 3.1.x. It has not been updated for 3.2.x and anyone who used that plugin is screwed because all the content on their board are in a CKeditor tag style.
There is a quill extension here, but when you use it, you miss out on some important Flarum functionality and i do not expect the developer of the extension to take on the responsibility of maintaining it for a life time.
This option could be baked into the cake as early as possible.