Hello,
Thank you for your feedback.
I do agree that the setting of the DragDropManager.MinimumHorizontalDragDistance and DragDropManager.MinimumVerticalDragDistance is not expected. I have updated your telerik points for bringing this behavior to our attention.
For the time being, you can set these properties to a bigger value at a later time in your application's lifecycle. Of course, feel free to contact us again, if you have any other questions or concerns.
Regards,
Vladimir Stoyanov
Progress Telerik