Oren,
When users double click the image, the image tag property dialog will be opened. It's cannot be changed to
ImageGalleryByBrowsing dialog.
However you can remove the items from image tag dialog to make it simple.
Remove items from individual dialogs
The following instruction shows you how to remove the browse button from insert link dialog.
Open Tag_A.ascx file and change the following code:
<button id="btnbrowse">[[Browse]]</button>
to:
<button id="btnbrowse" style="display:none">[[Browse]]</button>
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