I've tried every setting I could find. I don't believe they're actually being read - there may be a bug in NC4.2 and it's reading the defaults, not the ones specified in the RichEditor.cshtml file. It still forces <p> tags for new lines (I've set that to false, but it's totally ignored). Could it be permanently compiled somewhere?
I'm going to remove it altogether and put basic textareas in the Products description (and category description pages). I've used TinyMCE before on old classic asp pages and was able to change the parameters with no problem. This makes zero sense.