[Typo3] Multi-level permissions on new pages

[Jan Wulff]

Hi,

some days ago I've stumbled about the problem to define multi-level
permissions on new pages. Because I believe this is the easiest way to
describe what I mean, I give an example:
We have a page tree with 4 levels, the page root and the levels 1, 2 and 3.
Now a user should be allowed to create new pages in level 1 and 2, but not
in the root or level 3. This should also apply to new pages, f.e. new pages
in level 2 will be level 3 pages and should not allow to create new pages
inside them. The user could even create a new page in level 1 and another
one inside this new page, creating a new level 3 page by this way.

I thought about doing this by using default TSConfig values with TCEFORM
and default permissions with TCEMAIN together, but that would include some
(unwanted) hacks. Does anybody know a clean way to achieve this? 

If not, maybe somebody is interested in developing a solution to this
problem, together with me.

Best Regards
Jan