The mouse double click event won't be fired because the touch events are getting suspended when a touch interaction has been initiated.
We are currently working on exposing a public API for our touch manager, that will allow a more transparent workflow with the touch interactions. We are aiming at releasing it publicly in our Q2 2014, however we cannot commit to a specifig release date at the moment.
Furthermore, you can disable the touch interactions handling on our side by setting (TouchManager.IsTouchHitTestVisible to false on RadGridView). This however will disable any internal out of the box functionality like the TouchScrolling, and the Drag And Drop interactions on Grouping and Reordering Columns.
Hope this makes sense!
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