sorry, didnt catch that, simply remove defaul value from dropdown code:
detailDropdown("Ticket Type", "type", "pri", 1, 20,true, "", "$args.type", "no", "type", "$args.type","","","no","","", "", "Request", "R", "Incident", "I");
edited: one more miss :)
previos entry for empty default,
here is to opposite:
var ttype = "I";
if ("$args.type" == "I") ttype = "R";
detailDropdown("Ticket Type", "type", "pri", 1, 20,true, "", "$args.type", "no", "type", "$args.type","","","no","","", ttype, "Request", "R", "Incident", "I");