Yes, the full mobile CPU like that in the Lenovo Z400 is significantly faster at computations. For the things you listed, it sounds like you don't really need that. The full mobile CPU is important for full HD video editing (I don't mean casual and occasional, I mean those who do it many hours/week), calculating huge spreadsheets, compiling large applications (software dev) and for 3D games (BioShock Infinite, Facebook games don't need this).
The buttonless trackpads are used on most laptops these days.
-------------------- Lisa Gade Editor in Chief, MobileTechReview