I was able to get this working.
First, I wasn't able to locate that the table_responsive_width option in the /plugins/table/plugin.min.js file included with CMS Builder, so I downloaded the current version of Tiny MCE and found it there:
Next, I replaced the current /table/plugin.min.js file in CMS Builder with the one I downloaded from Tiny MCE.
The last step was to copy and rename the /lib/wysiwyg.php to wysiwyg_custom.php.
Then edit wysiwyg_custom.php to add this code on or around line 55:
Refresh your browser and you should now have % values for Width in the Table Properties.
Let me know if this works for you.
Damon Edis - interactivetools.com
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