My LO cannot sit still for too long, always need to pack a lot of stuffs to keep her entertain when she is in car seat. 
This is wat we have for 4 hours journey from Penang to KL... until the last 30 mins she started to be really cranky wanna come out already, luckily we were approaching our destination...

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How long has this been going on? My baby used to be carried in the car by my wife whenever we bring him home from babysitter. Even though we have a baby car seat, he will make noise & prefer to be carried instead. However, recently due to my wife's hectic work schedule, I've been fetching him home by myself & even though he initially did make some noise, he was OK with it after 3 / 4 days.

I think there is no easy way than just let him cried out. The earlier you gets it done the easier it would be in the future.
I would say 3/4 times my boy is ok. Except for long journey where he can only last 2 hours. After that need to be carried.
Other times I just let him cry the whole journey.

Actually, it's recommended to stop the car every 2 hours, and have everybody get out and stretch/move their body for 15-20 minutes, then only get back into car and continue journey. It's better for everyone's health. Even sitting at work, in the office, you should get up and walk around every 2 hours. Sitting too long actually shortens your lifespan.

The best way to train your kid not to cry in the car seat is to start short and sweet. EVERY day, strap your baby in the carseat according to instructions and drive at MOST 10 minutes away, to a fun place the kid will like, e.g. nearby playground, nearest mall, candy/toy shop, swimming pool, whatever la. This way, even if your kid cries, he/she is only crying for 10 minutes, and he/she will learn that after getting strapped in carseat, he/she gets to a fun place! Make sure to also strap in properly on the way home!

Once your kid stops crying for the 10 minute daily ride in the car seat, you go to a different place 20 minutes away, just as fun and exciting. Then if kid is ok with 20 minutes away, go 30 minutes away! Work your way up slowly until kid can go 2 hours. But please don't go for more than 2 hours unless asleep, ya. Like I said above, sitting still for more than 2 hours when not asleep is not good for your health. Always take frequent journey breaks. That's why our highways have lots of rest stops. When you have kids, your lifestyle has to change and your driving style also has to change, but at least when your kids are properly strapped in, you can drive at normal speeds, not slowly (which is not safe either), so the stops shouldn't affect the final time of arrival.

This method best works if you ALWAYS strap your kid in. If your kid thinks that as long as he cries long/hard enough he'll get out of being strapped in, then he will cry the whole way. If he knows that you WILL let him cry himself sick rather than let him be out of the carseat, he will give up eventually.

For more tips and tricks on keeping kids happy in their carseat, I love www.thecarseatlady.com/tips_and_tricks/tips_and_tricks_6.html.

the problem is that my baby dont want to stay in the car seat. she felt insecure. how?