Solved
Certainly there was no intention to disable these shortcuts.
I suspect these shortcuts weren't actually disabled by changes in the software, but rather by security changes in the Java Plug-In. I could be wrong, though. I do know that Java Plug-In security changes broke a lot of text component clipboard operations until applet code was modified to account for these.
At any rate, the way to get such things fixed is to file a detailed bug including Java Plug-In version, Windchill version, and precise location(s)/action(s) that fail.
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