[TYPO3] Using conditions in Page TSconfig?

[Jens Beckmann]

Hi,

I want to disable some BE-fields in some pages on level 5 in my 
pagetree. I tried conditions, but they wont work in TSconfig. Is this 
correct?

This is my Page TSconfig on root-level of the tree, but it does not work:

   # Disable some fields only on tree level 5
    [treeLevel = 5]
        TCEFORM.tt_content.imagewidth.disabled = 1
        TCEFORM.tt_content.imageheight.disabled = 1
        TCEFORM.tt_content.imagecols.disabled = 1
    [END]

(I have checked that it works fine without the condition, but then on 
all levels)

If conditions in TSconfig won't work, is there any other alternative to 
editing all the Page TSconfig on the pages that should be changed?

Thank you
Jens