Not quite sure if i'm reading this right but...
When you open the file in PS, just rotate it.
Same thing with your trying to find set points... just scan it and then make adjustments in PS. What will help you is to place a white/black/gray card next to your film strips so you can set it from that.
I have an iQsmart2 scanner and as far as I can see, these things aren't in the program. I couldn't find anything that allows you to enlarge just so you can see better.
That's why you open the file in PS and do the work there. Everything you are trying to do might take all of 20 seconds in PS.