Enabled always true with QT 4.6.4.
I have installed the QT-Support Module for TestComplete 8.50.618 with the file from http://smartbear.com/support/downloads/testcomplete/qt-modules/ named TestComplete modules (5.52 MB) under Qt 4.6.0 ...
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After trying with a QT demo application called Chip I get that a button is enabled as well although it is disabled in the view. Either the 4.6.4 is not supported by the 4.6.0 modules or more likely I have done something wrong installing them.