I found the ultimate solution to this - buy a new (business model) laptop with a better video card and screen. My top ("recommended") resolution is now 1600 x 900. The old one had a top resolution of 1366 x 768.
Pressing Control-Alt-0 to Fit Spread in Window on the old laptop gives me a 53% zoom level with fuzzy text that borders on unreadable. Pressing Control-Alt-0 on the new laptop gives me a 65% zoom level with text readable.
But, what I want is a command called: Fit Spread in Window But With A Smidgeon of White Showing Beyond The Margins. That turns out to be a 75% zoom level for me (which exists as a preset in the Zoom dropdown on the Application Bar at top of the interface), but I'll still need to do a script and map it to something like Control-Shift-1 because 75% does not result from any of the choices under the View menu. (Using Control-minus(-) and Control-plus(+) will get me to the 75% though). And, I want to get to that 75% without using the mouse.
Without getting too technical, I think working on a program like InDesign on a consumer model laptop (Acer Aspire 5535) with one of those horrible shiny screens is basically bad for your eyes. I'm now on a Lenovo Thinkpad W530 with beautiful matte screen (no glare) and text with very sharp edges.
I guess there are other solutions - like mapping Control-Alt-0 to a 75% zoom using a script to replace my current 65% zoom level.
Don't confuse a fixed zoom level with any sort of fit spread command. Fit spread, with or without a smidgeon of white showing, is a variable magnification depending on the size of the pages.
Thanks Peter, I didn't think of that (though I should have).