The animations go with the specific car. I'm making them so you can right click the car and the character interacts with it, like the Moviestorm chair. I'll be doing them for right hand drive vehicles too. If you have any right-hand drive vehicles in particular give me the make and model and I'll see what I can do.

Firstly; Thanks for sharing your Work-In-Development on this project.
The Great thing about your Dev. software there is a great and simple 'opposite' conversion process, along with some animation layering can easily have Left and Right-hand drive cars and character animations.

Interactive Cars are Cool.... :-) There could be so many fun animations possible.
I'm curious how you will code it into Moviestorm. MS-cars (will animate alone easily) and MS characters animations don't seem to work together;There is no "sit in Car" options in MS-cars.
I guess you are using animated props?
Held Props? so the character and prop are in exact right places or even simpler;
Invisible to camera character placements textures markings (_EG.foot prints texture) on/near the 'car prop'? So exact placements and animation synching will be achieved. ???
Though if you made a special MS-Chair that has 'snap-to' bones (alined to your MS-car/car prop 'snap-to' bones)
Along with a special 'sit in chair' ;left or Right hand drive (that includes an automatic walk to placement in-game) animation then everything will work smoothly...
Not using MS-Cars:?
If you have made your cars props compatible to The MS-Car size and wheelbase, then making your animated props drive is going to be easy on the MS-Car Nav-mesh like platform...
Out of curiosity I made a quick extension Addon of the standard Moviestorm Base01 MS-Car to only show the wheels; all other parts of the car are invisible: Just required 1 new texture and some editing in ModersWorkshop. The usual Attached Chairs used for character placement...
The Special 'Sit in Chair' animations, automatically 'animates' (moves) the MS-Character to exact places for the character to sit down:
I'm not sure how to do but it would be the 'key' in making great interactive siting & getting into car animations within Moviestorm.
Moviestorm; made easy for users, tricky for Developers LOL