New day, new app in Cydia: ProTapper. ProTapper is a MobileSubstrate addon, which recreates a native function of the Palm Pre. Its purpose it is to add a white dot on the screen which correspondes to the finger tap area.
Of course this has no benefits at all, but some users might find it useful for (maybe) video presentations?. The consumption of RAM is minimal, since the operation is extremely simple and does not support multitouch. You can find ProTapper in Cydia for free.