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void ChangeFlag(str name, bool value)
Enables or disables the specified actor flag of the activator. Zandronum equivalent of SetActorFlag. Also see ChangeActorFlag.
It works by giving an item that calls A_ChangeFlag.
decorate/changeflag.txt
from ACSUtils to your mod.
ChangeFlag("SOLID", true); ChangeFlag("SHOOTABLE", false);