Hello Graeme,
This feature is currently not supported by the Sortable widget. We do agree that it is not convenient for the user to release the sorted item multiple times so we will consider adding automatic scrolling in one of our future releases. Please vote for the feature request item listed in my previous reply - the more votes it collect the higher priority it will have when we build the next roadmap.
Regards,
Alexander Valchev
Telerik
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