Originally I planned to create a full fledged wysiwyg editor like on medium.
Frankly, this just takes too much time currently. I have to postpone that most probably to Poster 3 (which is very far away, I guess years).
Still, Mr. @TemplateRepo was able to convince me to build an intermediate markdown editor (which was not my initial plan), which will be part of the current Poster 2 stacks.