I am currently working on updating and enhancing the current vehicle implementation in various areas.
atm, I have given vehicles the ability to jump. I am also working on giving vechicles different operational 'modes' - to cater for things like the Droideka.
Eventually, this new implementation will be included in the OJP
More details here
If anybody has any requests, suggestions etc. feel free to post here, or in the OJP thread.