По-другому никак:
Код
new bool:gbTheFirstRound;
public OnPluginStart()
{
HookEvent("round_start",Event_RoundStart);
}
public OnMapStart()
{
gbTheFirstRound=true;
}
public Event_RoundStart(Handle:hEvent,const Srting:sName[],bDontBroadcast)
{
if(gbTheFirstRound)
{
gbTheFirstRound=false;
//function
}
}