It's funny, it is actually supported by the game now - BUT - I made a last minute mistake with the build and forgot to add one line to activate the ballistics mode for weapons when finding the ballistics definition in the weapon specification file. So it will work in 0.88 then, I should get the release done on Sunday which would make it available next week.
In that, you'd make rockets or bullets fly in a ballistic curve using the same parameters as with grenade throwing, e.g.:
Code:
<ballistics curve_height="3.0" near_far_distance="5.0" speed_estimation_far="17.0" speed_estimation_near="20.0" max_speed="11.0" randomness="0.07" />