[TYPO3] Default Content Element, also in subpages

[Sven Wagenhöfer]

Hi there!

Imagine this situation:
You have a sidebar on your site, and have many many pages with the same 
sidebar content element(s), but only some with other content - and here 
the default content should not be shown, but the specific element.

Now, I am searching for a way to do this with Typo and TemplaVoila. It 
should be possible for the editor of a page to define an element as 
"STandard". and then to override this ob subpages simply by putting 
another element there.

Does anyone have an idea for this or even a plugin which does such things?

Thanks a lot :)

Sven