With my standalone scanner, I used Irfanview to scan individual pages and automatically save them as PNG (or whatever) files, with specific file names that can contain a counter :

So basically, open the scanner, press Alt+S (or the shortcut that scans the page), Irfanview receives the page and automatically saves it as png as ScanImage00001, then flip the page manually and press Alt+S again to get ScanImage00002 and so on.
I'm scanning just odd pages, and then scan the even pages in another folder.
Irfanview also has a batch conversion/rename feature, so I can load a whole set of even or odd pages and crop the borders and if I want to Auto Adjust Colors or reduce to Grayscale or increase contrast, whatever.
Basically, rather then messing with the scanner's options to select a specific part of the page to scan, I just scan the whole surface and then do a batch crop on the whole image set.
Total Commander has a Multi-Rename Tool where you can select the whole folder with ScanImage0001 , ScanImage0002 and you can specify to have the file names changed .... basically you can say Rename to "Page[C].png" and define C as counter, start from 1, jump by 2, 3 digits every time... so now your odd pages become:
ScanImage00001.png -> Page001.png
ScanImage00002.png -> Page003.png
Repeat with the "even" image set , but configure the counter to start from 2 instead of 1.
At the end, you can merge the two folders and you have the whole book as consecutive png images. You can feed the images into an ocr software like Abby Fineprint or something else, or you could just use Adobe Acrobat Pro to create a big PDF out of it.
With a multifunctional I'd imagine it's the same thing.... basically I'd hit scan to scan the whole set of pages on one side, the scan the other side, then use rename tool to set counters in the file names to put the files in the right order.
If the original book is in any way dispensable, go to a print shop and have them use their large guillotine to slice off the spine, leaving you with a stack of loose pages you can dump in the ADF and scan all at once. It'll produce better output with far less effort.
Yeah. When i don't care about the spine, I just use a ruler or one of those sharp blades to cut the pages at the spine, then simply align the pages, put the side that wasn't manually cut to the edge ... i can always batch crop the pictures to remove the "noise" on the edge.