TYPO3 Core

This feature is also requested by me.

patch against the current trunk attached

I've tried adding this in a page TSconfig:

$GLOBALS['TCA']['tt_content']['columns']['imagewidth']['config']['default']=111;

To put the value 111 pixels per default in Image/Text element and it doesn't work with the patch.

The same line is working if using typo3conf/extTables.php

Is it because it doesn't work with ['default'] ?

I don't know what your code has to do with "TypoScript" (TS)??,
so what this patch and this bugtracker entry is all about is TCAdefaults via page TS
as explained here:
http://typo3.org/documentation/document-library/references/doc_core_tsconfig/4.1.0/view/1/2/#id3822379

try it again like this (this time in the page TS field):

TCAdefaults.tt_content.imagewidth = 111

;-)

Committed to trunk