try change code in this part
// Shop NPCs -- supplying no argument displays entire menu.// callfunc "qshop"{,<shop ID>{,<shop ID>{,...}}};//============================================================prontera,164,203,6 script Quest Shop#1 4_M_MOCASS2,{ callfunc "qshop"; }
callfunc "qshop"{,<shop ID>{,<shop ID>{,...}}}; make it like this
prontera,164,203,6 script Quest Shop#1 4_M_MOCASS2,{ callfunc "qshop",1; }
it will automaticaly open first category shop without generating category menu, AFAIK CMIIW