Hidden gesture: use keypad to scroll sideways
Pretty sure I haven't read this one here. See those extra, small keys at the beginning and end of each row? Besides q,a,z,p,backspace, and enter keys? You can cover them up and then swipe horizontally to scroll through the next screens. I use it (and found it) on Twitter while scrolling through the timelines. Not there for nothing I guess. Cover those extra keys under the hand holding the device, swipe across with other hand to get to the next screen/cascaded frame, if available.
Update: covering them up also locks/switches off the keyboard gestures.
What I mean and how it works: So you can use the keyboard to scroll through the webpages, right? But that's just vertical scrolling. Now if you open the native Twitter app you can swipe across the screen to go the next screen/tab from the Timeline to the Discover tab then to the Interaction tab. So instead of using the keyboard for just vertical scrolling with up and down gestures, you could also use the right-left gestures for horizontal scrolling. Just cover up those extra keys under the thumb cushion of the hand holding the device (left hand for me) and then swipe across the keyboard with your right hand (like you would to delete a word), and that will take you to the tab/screen/frame, if available.
Also, when inside the CB app you can use the keyboard to scroll right? Cover up those extra keys and it locks the keyboard and gestures won't work.