Learned a little trick with `onboard` and using the Autoscrolling feature of Firefox.
Firefox, for those who don't know, supports a feature called autoscrolling… if you middle-click (click the scroll wheel down), a little circular icon appears in the spot where you clicked. Moving the mouse cursor up or down will scroll in that direction, with the speed determined by the distance from that icon.
Clicking again stops the scrolling.
On a graphics tablet with three buttons, this works great. At work I have a cheap Wacom, and I find this more comfortable than scrolling with an ordinary wheel mouse. Just click the middle mouse button, then swing the stylus up or down.
Turns out, you can do it on a touchscreen using Onboard. There are buttons on the virtual keyboard that affect the mouse: tapping one of these will make the next mouse click use the specified button (middle or right). So you can tap the middle mouse button on Onboard, tap somewhere on the webpage, and the autoscroll icon appears, then hold your finger or stylus on that icon: slide up to scroll up or down to go down. Very simple.
