Not only the rotation center doesn't snap to grid or other snap targets - none of the transformations do either (compared to the transforms with the select tool).
Related to or duplicate of Bug #590261 “[Node tool] Scale/stretch/skew transforms with transform handles don't snap”: <https://bugs.launchpad.net/inkscape/+bug/590261>
Not only the rotation center doesn't snap to grid or other snap targets - none of the transformations do either (compared to the transforms with the select tool).
Related to or duplicate of /bugs.launchpad .net/inkscape/ +bug/590261>
Bug #590261 “[Node tool] Scale/stretch/skew transforms with transform handles don't snap”:
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