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.
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).