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I have read-only numeric values in my grid (colType=ro, colSorting=int). Is there a way users can select and copy some of the values?
If I set colType to "txt" instead of "ro" it can be copied but sorting got broken and I can copy one cell at a time only.

You can 
a) enable native selection in grid
http://dhtmlx.com/docs/products/kb/index.shtml?cat=search&page=1&q=8058&ssr=yes&s=onselectstart

b) use custom block selection 
http://dhtmlx.com/docs/products/dhtmlxGrid/samples/clipboard/grid_selection.html?un=1238505539000

>>If I set colType to "txt" instead of "ro" it can be copied but sorting got broken and I can copy one cell at a time only.
If problem with sorting still occurs for you - please provide any kind of sample where it can be reconstructed , normally , column type must not affect sorting.