While a drag car would be nice to have, it would still be virtually worthless until LFS's drag strip works correctly. Frankly, the only way that the drag strip is the least bit of fun is if you run the ISRM mod (
http://www.lfsforum.net/showthread.php?t=28815). Otherwise, drag racing in LFS is completely unrealistic and not fun at all.
We need 60' times, reaction times, staging, redlighting, etc. implemented in the game. But most importantly we need the tire physics bugs fixed and the car setups made more realistic.
Until these things are done, having a drag car would be completely worthless. If these things
do eventually get done, having a drag car would be mostly unnecessary anyway.