Hello Marcin,
Thank you for the suggestion. This is indeed a valid Feature Request and I have added an item on your behalf on our Feedback portal:
https://feedback.telerik.com/kendo-jquery-ui/1498884-resize-image-by-dragging
Based on the interest demonstrated by the community in such a feature, along with our priority queue, we will consider it for future implementation.
Regards,
Aleksandar
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