OK. I FIGURED OUT AN ANSWER TO MY QUESTION 3 !!!
When ALL IN ONE SEO plugin is activated:
http://semperplugins.com/plugins/all-in-one-seo-pack-pro-version/
I cannot save anything in the Category Header section.
Any idea on your side what could be the matter ?
I’ll ask for support with them also of course !!
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As for “real” content, cool, I can actually add a revslider in there for example.
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My questions 1 and 2 are still open :0) T H A N K S