In The sandbox mod it is shown that it is possible to spawn a sprite(box).
now i was thinking,if you cal do this with every sprite you could go it >>>>>>>> in the air and make it re apear when leaving the map
for example for a bird,or plane or cloud to fly over
or you could make it spawn in the air and make it drop for example rocks or leafs,or wathever sprite you have
this is just an idea i dont expect it to be possible as i do not know the full scripting language of soldat