Touchpad

Direct touchmap mode feature doesn’t work for waydroid since uinput is not avaiable in the container, but we can use a simple udev hack.
That is, replacing ID_INPUT_TOUCHPAD with ID_INPUT_TOUCHSCREEN in the udev database.
Here’s a single-line command to do that easily:

 sudo find /run/udev -type f -exec sed -i 's/ID_INPUT_TOUCHPAD/ID_INPUT_TOUCHSCREEN/g' {} \;

To revert:

 sudo find /run/udev -type f -exec sed -i 's/ID_INPUT_TOUCHSCREEN/ID_INPUT_TOUCHPAD/g' {} \;

On Plasma, you can enable “Touch points” from System Settings > Window Management > Desktop effects to visualize touches.