Using WheeledRobot for a bot with mecanum wheels?

[superfast852]

The wheeledRobot class has the function computePoseChange, which is built for differential drive robots. Problem is, i'm using a mecanum robot, so it cant just be leftWheelOdometry and rightWheelOdometry. I thought about making my own implementation of the computePoseChange function, but i don't really know how the dXY returned should apply for my robot. Any help?