Calculating burn time for a drop on target? The burn length isn't even adequate for them to reach a target in most cases, much less adjusting it to fall on target. Quality of fuel? The recipe is fairly simple. Environmental considerations? Keep it dry. Trajectory settings? Maybe...if the rockets can reach intended targets. Batteries are used for ignition only...not part of rocket.
U.S., allies conduct 1 air strike in Syria and 11 in Iraq against ISIS militants (Reuters)
from the article: 'Hamas weapons capability increased four-fold over last five years'