There was no mention of editing the "Action" tab, so it was left as-is.
When I run the task from within Task Manager, the CCleaner interface opens without a UAC, but when I select "Open CCleaner" or "Run CCleaner from the recycle bin context menu, I still get a UAC
Wait are both the features you mention from context menu...hmm I don't use those but I wonder if they bypass the task by straight running ccleaner64.exe instead of ccleaner.exe