A RWY CHANGE WHEN ON THE KSINO RNAV ONE ARR TO LAS; NV LEADS TO LNDG WITHOUT CLRNC.

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WE WERE CLRED VIA KSINO ARR FOR RWY 25L. VERY LATE ON THE APCH; THE CTLR CHANGED THE CLRNC TO KSINO ARR; RWY 19L TRANSITION. I WAS THE PNF; IT TAKES TIME TO CHANGE THE APCH; REBRIEF AND REQUEST NEW LNDG NUMBERS FOR THE NEW RWY. THE CTLR WAS GIVING US VECTORS FOR A CLOSE IN L BASE FOR RWY 19L. IT HAD PUT US ON ABOUT A FOUR MILE FINAL. THE ACFT WAS PROPERLY CONFIGURED FOR LNDG AND ARE THE CHKLIST COMPLETED. THE CTLR CLRED US FOR A VISUAL TO RWY 19L. I HAD TO ASK HIM TO CONFIRM THE RWY AS RWY 19L. HE WAS TALKING TO OTHER ACFT AND REALLY NOT PAYING ATTENTION TO US. AFTER LNDG; I REALIZED WE HAD NOT SWITCHED TO TWR FOR LNDG CLRNC. THE CTLR DID NOT SAY ANYTHING. WE SWITCHED TO GND CTL AND RECEIVED CLRNC TO THE GATE. IT IS MY OPINION THAT THIS LAST MIN CHANGE IS NOT REALLY A GOOD PROC ON THE PART OF ATC. I CAME VERY CLOSE TO ABANDONING THE APCH; HOWEVER; PROCEDURALLY; WE HAD COMPLIED WITH ALL THE REQUIREMENTS; CHKLIST COMPLETED AND A STABILIZED APCH. BOTH OF US ARE EXPERIENCED PLTS IN THIS TYPE WITH A LOT OF EXPERIENCE FLYING IN AND OUT OF LAS. THE NEW STYLE ACARS REQUIRES MORE STROKES TO RETRIEVE INFO AND IS NOT USER FRIENDLY AS THE OLD STYLE. THE DATABASE IN THE FMS HAS AN RNAV APCH FOR RWY 19L; HOWEVER; WE DO NOT HAVE PLATES FOR IT. ONLY THE VISUAL APCH FOR RWY 19L CAN BE LEGALLY EXECUTED; WHICH WE DID. HAVING AN APCH IN THE DATABASE IS ABSURD AND CONFUSING. IN THE FUTURE; I WILL NOT LET ATC PUSH ME AROUND; IF THEY ARE OVER TAXED I WILL BE HAPPY TO HOLD UNTIL THEY SORT OUT THEIR TFC PROBS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RWY CHANGE WAS MADE PASSING CUTAX INTXN WITH AN ASSIGNED SPD OF 230 KTS INSTEAD OF THE CHARTED 210 CROSSING SPD. REPROGRAMMING WAS COMPLETED IN TIME FOR THE CHANGE IN THE RNAV COURSE; BUT A DISTR WAS CAUSED BY USING THE ACARS TO RETRIEVE NEW RWY INFO AND SEARCHING FOR THE RNAV APCH TO RWY 19 WHICH THE COMPANY HAS ELECTED NOT TO PROVIDE. THE CLRNC TO CONTACT THE TWR WAS GIVEN AT THE POINT IN THE APCH THAT LNDG CLRNC IS USUALLY RECEIVED AND WAS ACCEPTED AS THE LNDG CLRNC IN ERROR.