I checked and yes seems that you're right and there is a bug there that the "interceptStart/end" option doesn't work. We're sorry about that. I will pass your report to the Dev today to fix it for the next version.
Now if don't want to wait there is an alternative solution for you. You can use the pc XDesigner to edit the widget as you want. I always use this method because in my opinion it's much easier and faster.
XWidget supports real-time editing so connecting your phone to the pc (with usb) you're able to create or edit widgets and see the changes directly on your phone screen.
For more info read here
viewtopic.php?f=23&t=3776If you need help let me know
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