Pressure sensitivity on LANDS' Oekaki
yes, it's possible

Not sure if this works for everyone, but I am most certain
it works on all Wacom boards. This is what you have to do.

Step 1. Install this on your computer: JTabletSetupv0.9.5.exe
Step 2. Close browsers, open a new one. In the applet where you draw
there should be a [P] sign in the top right corner of the canvas. When
you click it, there will be a small popup window on the applet, where
you can set options for pressure sensetivity.