// server.cpp
// somewhere before serverslice() definition
int nextspammsg = 0, nextspammsgmillis = 0;

void spammessage()
{
    if(!scl.spammsgs.length()) return;
    if(servmillis > nextspammsgmillis)
    {
        if(numclients() > 0)
        {
            if(!scl.spammsgs.inrange(nextspammsg)) nextspammsg = 0;
            sendservmsg(scl.spammsgs[nextspammsg]);
            nextspammsg++;
        }
        nextspammsgmillis = servmillis + 10000;
    }
}
//after if(servmillis>nextstatus) block into serverslice definition
spammessage();

// protos.h
// replace vector<const char *> adminonlymaps by :
vector<const char *> adminonlymaps, spammsgs;
// bool checkarg()'s switch
case 'G': spammsgs.add(a); break;