If you look more carefully, you'll find that's not true. Adjust your thumbnail size to display six items in a row. Select item 2 in one row and then shift-click item 5 in the next row. In Windows and all other software, this select from item 2 in the first row through item 5 in the following row. In FTM, however, it selects items 2-5 in row one and items 2-5 in row two.