native set_gamerules_float(const class, const member, Float:value, element = 0);
Value to set
Element to set (starting from 0) if member is an array
Sets a float value to the gamerules object based off a class and member name.
This function has no return value.
If member is empty, no offset is found or an invalid offset is retrieved, or the data type does not match, an error will be thrown.