For JMP 9, in addition to the regular decision tree, the Partition platform will include random forests and gradient boosting. JMP calls them Bootstrap Forests and Boosted Trees, respectively. These features will only be available in the new JMP Pro edition. The Partition platform will include several other new features as well. JMP 9 is being released in October.
For JMP 8 and earlier, the Partition platform produces standard decision trees only. And you are right, it would take some serious programming to implement random forests through scripting.