Hi Amer,
Thank you for your input! I'd say that these icons should be included in the built-in tools by default.
I opened a dedicated feature request for that on your behalf: Add icons for the built-in "Rename" and "Delete" options of the Context Menu.
Regards,
Nadezhda Tacheva
Progress Telerik
It's great to have the option to customize menu items and icons to address the current inconsistency, as shown in this screenshot. Thank you.