yes, u can do it. the driver maybe is 'sam seng' ...he may not quarrel with u..but he will come back next round...
and u may suprise to see wat happen to ur car and housemate car next morning.....
see wat the old woman do on pasar malam ppl....she come out to stick the paper at all window...i means 4-6 paper per car.
when the ppl come back to the car..they scold her and ask her come out but she not dare come out....

OH MY~...which JPJ gave them the driving license???

>,<

i dunno if this because im a A type person, but for me the best way..is; if i know who did that, just go to her/him and slow talk~
or if i don't know, just stick a post-it on his car. if use nice words, people wont agry~

the road outside your house does not belong to you. So, there really is nothing much to be done. If it is due to pasar malam then you can complain to local municipal. Or do something like put cones or some heavy thing during pasar malam night.

But if it is not related to pasar malam then you are being too much. The road outside your house (at the side) does not belongs to you. You cannot stop people from parking there. Just like how you sometimes also park in such spaces outside other people's house.

When it's so bad that it causes inconvenience then that is different story. I see a lot of houses, they put lots of potted plants there and I find these people very selfish and I don't understand why they do not want people to park there as it does not block their entrance.

in your case where they block your car then it is justifiable. Those people need to be given a lesson on being civic minded. Depends on you want to go the "ganas" way or "nice" way.

Nice way is to talk to them not to do it nicely.

Ganas way is to park your car and block them. When they honk, take 5 minutes to come remove your car. Tell them...now how you fell about being blocked.

Or the usual way..puncture their tyre. But make sure it doesn't backfire when you need to move your car and their punctured car is blocking.
Or my method....tear out the rubber from their window wiper. They will usually know only when rains. And this can be done very fast...less than 1 minute. 

Im sure you can park the 2nd car outside your house ,albeit blocking your own gate. But you wanted to "claim" the free spot next to it somemore.
The "walk at night. dangerous" excuse is so lame. Walking is good for your health. it'll do you good in the long run. Anyway,  guess its time to find a house with bigger porch to accomodate your 2 cars.
Thats the disadvantage of living near commercial area. If you wanted to enjoy the convinience of food and shops within walking distance, prepare to face other kinds of inconvienience. The final verdict it, the road or any part of it outside your own property , IS NOT YOURS

you sounded like , since you cant reason with them, and law wont help.. you also wanted to join them. this is how our Malaysian mentality continue to flourish .  Everybody wanted convienence to the max.
You're still dreaming . the SPACE is NOT YOURS to begin with.  Make sure or not... nobody can help you. I believe you wanted to "feel at home" by getting positive respond from members here... so that you will feel better and not the only one doing so, hence you can happily do it .