Oh I love this one... it's the oldest OLDEST thing wrong with Sitefinity.
1) Yes, contstantly, every release of SF and the RadEditor introduces multiple new problems, its always been a disaster. Kendos editor is moderatly better, however to "work" properly in the editor it injects INLINE STYLES (kill me now). There have been many MANY threads on this over the years, and even if we find issues and they manage to be fixed, new browser version comes out and WHAM...new issues, AWESOME!
2) Missing? ...reliabily good markedup content
Part of my job is to go "fix" radeditor content, regular content editors dont know html, they can't manually fix anything...I hate how it constantly borks things, and it can never be fixed or made better.
Here's what I would like...
Kendo (will) support Markdown in the next release. I would like a global backend setting to tell a site if they want "rich" html, or markdown. This way I could have all new sites be markdown first which is vastly prefereable for consuming the site content from external sources.
<h1><p></p><p></p><p></p>Okay, thats all I <span>have</span> for now<p></p><p></p><br/><br/></h1> (thx radeditor)