Its more money because there is more work. There has to be a sensor on the e-brake.. It is safe if done correctly
Usually it goes like this
1. car running
3. set e-brake
4. get out and lock car
5. shut off car with remote start remote
THEN the car will restart with the remote AS LONG AS you don't open a car door. That is the ONLY way you can be sure the car is still in nuetral otherwise the car could start in gear.
Seen a civic go into a dumpster that way once LOL
Speed is only a matter of money; how fast do you want to go?