Scrolling by touching the white space between the tiles is possible. If you disable selection scrolling can work as expected. Note that for tablets the scrolling container must be an element outside of the tilelist. A workaround that fixes the majority of the issues is available in the attached sample.
Would be incredibly handy if we could programmatically set the image to a byte array with the RadImageTile (or I guess RadImageAndTextTile). Right now you can only set it via the ImageURL but we don't want to store the image like that, we want to read the image from the DB, so we're reading it out as a byte array. This is possible in your RadBinaryImage, I think, but not in the RadImageTile.
Currently the mouse wheel scrolls a fixed amount of pixels. A property should allow the developer to control this speed. Leave your comments below on the way this property should be implemented (e.g. an enum or an integer from a given range).