Don't get me wrong, I like the approach to addressing a major limiting factor in low power launches. I am not against the idea; I just see some issues that need to be worked out. Low power tracking smoke isn't all that visible at high altitude; on the few occasions when I have been able to follow an LPR to 1000+ feet, the tracking smoke from the delay was a tiny whisker that was only just barely perceptible at the very limits of my (well-corrected) visual acuity, and all but lost in a vast sea of sky. These aren't big motors and the small delay grains in them don't emit profuse clouds of smoke. Even talcum used for deployment detection doesn't help all that much at extreme (for LPR) altitudes.

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SAM # 0011