Suggestion to have click-through as a per widget option on all platforms

Qt's TextEdit.app does click-through on all its widgets, in comparison
with Apple's TextEdit.app, which doesn't support click-through on its
text field. There's a section on it in Apple Human Interface
Guidelines[1]. And Qt seems to already support Command-clicking in
order to click-through the widgets without activating the application.

From what I've read this setting should be available per-widget, and
not only on Mac, but on Windows too, because Microsoft Word 2000 and
Excel 2000 don't support click-through[2]. So probably it could be
helpful to implement this feature not only on Mac OS X, but on all
supported platforms.

[1]http://developer.apple.com/documentation/UserExperience/Conceptual/OSXHIGuidelines/XHIGWindows/chapter_18_section_5.html#/
/apple_ref/doc/uid/20000961-CHDBBJBH

[2] http://web.archive.org/web/20041019075909/http://mpt.phrasewise.com/2003/05/09

Explanation of the issue:
http://daringfireball.net/2003/05/the_problems_with_clickthrough