The issues you describe here have now been logged.
You can track them for fixes in future releases here:
or by looking for the issue IDs in changelogs (CS-1742 and CS-1385)
As far as a workaround goes, you can improve the functionality by removing some filters and (though this would also remove the ability to post links or images, which could be alleviated by creating new macros) but unfortunately the dedicated user can still pretty easily break the rich text / plain text editor interface. This is a known issue and will hopefully be fixed in future releases.
Thank you very much Chase for following up on this.