no, i think u can spawn as many as u want if u didnt put it on, like say a banshee, if u put like some warthogs, mongooses, and w/e else, and u change them to a banshee and there was no spawned banshee on the origanal map before it was modded, then u should be able to get more on the map.
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the reason why the flame gernades didnt mod is because if u already put them on, then there can only be that many, and the map wont load anymore, so next time, dont put the fire nades down, just mod them in so u can have more.