A touch of the five year+ frustrations .. (and I'm considering trying again after a 2 year break?)
At the time I gave up.. the whys:

ODE.. however, Bullet on OSGrid appears to be the answer.
LSL .. vehicle functions appear to be near complete and debugged.
Crossings .. broken and probably may stay ...

Here's your script modified to produce Whiter Smoke that looks like smoke :ugeek:
off() {
llParticleSystem([]);
}
on() {
llParticleSystem([ PSYS_PART_MAX_AGE, 7.900000,
PSYS_PART_FLAGS, 267,
PSYS_PART_START_COLOR, <0.91941, 0.91941, 0.91941>,
PSYS_PART_END_COLOR, <1.00000, 1.00000, 1.00000 ...

ODE is not vehicle friendly as you know.

Is this still an issue?
With the Kitely mega a smooth crossing is a huge advantage to SL for sailboat racing. But if the configurable (Flotsam) wind is only in the SW 256 then that forces the boats to carry the wind. That's a existing method from SL..
Sailboats are a vehicle in LSL so the Bullet ...