Yes FPSC has support for Physics and Gravity in built to an extent by default.
If you want to extend this though you will need to read the through manual regarding the script commands and actions available and experiment a great deal with scripting to get it to work well currently. Studying the defaults scripts may help. The manual is not explicit in dealing with gravity at all.
Editing the source may provide some extended capability.
Physics and gravity is a very complicated discipline to master if you want anything other than what the default gives you.
Theres no other way to ensure success in FPSC other than to do it yourself as FPSC is somewhat system independant in individual sceanrios sometimes behaving quite differently for different people.
My advice - wait for the update.
"I am and forever will be your friend"