I removed the Table Design tab in the Table Wizard for you. All you have to do is to replace the original dialog with the modified one - the dialog is placed in /Program Files/Common Files/Microsoft Shared/web server extensions/wpresources/RadEditorSharePoint/4.x.x.0__1f131a624888eeed/RadControls/Editor/Dialogs
Please find the dialog attached.
I hope this helps.
the Telerik team