OK. I did an ugly solution to prevent tinyMCE from inserting "/>" slashes in HTML 4.01 documents.
i got in the core file "tiny_mce.js" and changed every hardcoded "
" into an HTML-standard "
". I did the same with "... />" changing to "...>".
Maybe now in the manager view, tinyMCE has some non-xhtml-standard "
" tags. But i think it is even better to have clean, validating code in the frontend....
I just can appeal to the development crew of Modx, to get rid of using an wysiwyg editor for inserting content in the next releases. I know its hard, but it is worth it