This makes sense. Didn't know that. Anyway it would be nice to inject all parameters of handling.cfg (or DFF data, correct me if i'm wrong) line into the MTA. I'm currently playing with my friend on a LAN server, and custom vehicles are making the game more exciting.
Handling line does not apply correctly. I've put stock ELEGY handling line into .hnd file and mixed with different custom cars (DFF & TXD), and car is much more powerful than stock ELEGY. I hope you'll fix this.