Movie selection is terrible? I dun think so. There are way different selection for you to choose from.
The website is a bit buggy. But think it have improved somewhat.
Do u mean upgrade to PE using miles? Check under the “Krisflyer”, under redeem/use miles.
But it is not cheap to upgrade to PE. Not worth it.
You can check under “krisflyer/earn miles” to see which program you can credit to