Just thought I'd chime in briefly with a tip for fellow owners (I have a JP Pro).
If you find yourself getting annoyed from having T-Rex Multiball hurryup starting before you're ready to play the mode (due to it starting as soon as you complete T-REX via the truck, which can easily be done by mistake during another objective), you can change a setting so that all T-Rex modes must be started via the Left Ramp, including TRM.
This setting both prevents the multiball hurryup from starting before you're ready, but it also makes the first T-Rex mode random (changeable via the truck) which also helps add a bit more variation to each game which is nice, instead of TRM aways being first and the others random after that.
I forget the exact setting number, sorry, but it shouldn't be hard to find.