Where to put additional config for TinyMCE?

I have to allow custom HTML in a RichtText field. Since the authors are trustworthy, I disabled the safe_html transform. Problem ist that TinyMCE still cleans out style tags because "style tags are only allowed within the head" http://www.tinymce.com/forum/viewtopic.php?id=25443

Since I do need the style tag within body and almost all browsers know how to handle this, I'd like to add additional config for "my" TinyMCE.

valid_children : "+body[style]"

Where would/should I put that additional config?

If that extension in combination with disabling safe_html transform would be useful for others I also could make that change in Products.TinyMCE itself - just need some pointers.

I think you are fine just making the change in Products.TinyMCE.

You'll want to look at the getConfiguration method here: https://github.com/plone/Products.TinyMCE/blob/master/Products/TinyMCE/utility.py

done https://github.com/plone/Products.TinyMCE/pull/103