You mean '8 Ball's Shop near the port right?
Has a scripter said whether this is possible to script?
I dont think that the car respawn will really be an issue because when you are using it in RP situation;
1. Assasination: You will be targeting a particular person so the car can be parked right next to them, then the assassin runs away and blows it up, hopefully the target doesnt run, the cars dont respawn that fast
2. Blowing up a building/ganag base: well you can do it quickly before it respawns
I dont think there can really be a RP situation when you would park it and wait for ages (long enough for it to respawn)
P.S. sorry this was a bit wordy but i didnt know how to show my opinion!