I would like to be able to use ANY actual content part anywhere... I mean, if I have a WYSIWYG HTML created and I would like to have it included in several articles, then I should create it once and add a "Current Content-part" content-part anywhere else I need the WYSIWYG HTML...
TYPO3 uses this technique, too (insert record). What you are looking for is a kind of "reference" content part which acts like a link. I don't want you to chance your cms (I use phpWCMS and TYPO3). It is only for others to understand what you tried to explain.
To further state what I think Will is asking: It would be nice to include a content part from one article in many places throughout the website. This would allow for changes to be to the one content part which would cascade to anywhere that it is included. It might be included with a replacement tag such as {INCLUDE:[page_alias]:[content_part_ID]}