Is there a way to force that sorting _always_ happens server side, so for small datasets as well? (I also need this for filtering btw) Do I need the exposure of the Resultset for this by any chance? (which i coming I believe)
Yes, in SmartClient it's useClientSorting:false, and useClientFiltering:false, but you do need ListGrid.dataProperties or ResultSet to be able to set these.
The underlying SmartClient property is filterEditorType, you could use JSNI to set it on the ListGridField object. There's no way to really set it globally (you're trying to set it on a particular field).
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