xvkbd In LXDE one can also use the xvkbd utility to get a virtual keyboard. If clicking on it with the stylus keeps repeating keys indefinitely, go to the xvkbd menu (bottom left of keyboard), choose "Property", and set "Automatic Click" to "OFF".
But I noticed one minor problem: If there is an icon in the panel where the mouse cursor will be placed, that icon will be launched. So you'll have to take care to click only areas where no icons are in the panel.