Sorry for late reply, I am currently on vacation.
Generally, simulating pressure is just a matter of applying force on the the nodes along the normal direction. The slightly tricky bit is that the normal direction changes as the object undergoes motion, Because of this, we will need to implement a custom goal for this, rather than just use the "constant goal" that have already been in the package.
This is conceptually simple but will take a bit of works to code it up. I have added it to my to-do-list. Currently my main priorities are to make the tool more stable and improving the display/feedback