Jason,
You can overwrite the double click event. But it will impact many things of Cute Editor. I don't suggest you do this.
Here are my suggestions:
1. How to disable tag.aspx dialog when double clicking on images?
Please open the following file:
CuteSoft_Client\CuteEditor\Dialogs\tag.config
And remove the code below:
<add pattern="IMG" tab="IMG" text="[[Image]]" control="Tag_Image.ascx" />
2. Modify the dialog directly and integrate with your own code.
Hope it helps.
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