Some of our initial designs included as well such a side plate for a mouse. We realised, that it would not really make sense... weird... but it is the case. Who would like to constantly have to hold the mouse ? Probably not many people. We believe, that most users will either use the laptop's trackpad, the tablet's touch screen, the iMoov Teclado's trackpad or a mouse on a mouse pad -- all depending on the circumstances.