I think these types of things (for the general public) is best when used WITH conjunction with the mouse and keyboard, not replace them . Imagine when reading a website you just swipe your fingers to the left to go back the previous page, or maximize a video by opening up your fingers. I use Fire Gesture add-on for Firefox, I find it to be really useful shortcuts for internet browsing. I just right-click drag to the left to go back a page, no need to move the cursor the the ‘back’ button or remove my hands off the mouse to press ‘backspace’ on the keyboard. This could be similar to finger gestures on tablets.