How many buttons does a gaming mouse need? If you ask ROCCAT -- for today at least -- the answer is three. Evidently not happy with the current choice of tri-buttoned peripherals, it's launching a new "Lua" model at both Computex and E3. As well as the aforementioned triplet of clickable appendages, it houses a Pro Optic R2 sensor which will let you jack the DPI setting from 250 up to 2000 and back again on the
