I have an older (late-2011?) iMac and a newer APC model (Back-UPS BR1300G FW:863.L2 USB FW:L2). I have always had the separate "Computer sleep" and "Display sleep" options in either the Power or UPS tab. If I can find it, I'll be happy to upload the extension/app/framework/etc., however, I can't find anything, appropriate, with "APC" in the name.
Of course, different models may need different code. Still, I'll look at the APC site for any suggestions. Frankly, Apple is beginning to get my goat with the way they remove things that many of us still use/need. Of course, they told us what the 'future' would be when they dropped "Computer" from their name...
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later (after eating the last helping of my first soup/stew cooking event): Unfortunately, it appears that Apple accepted info from APC and rolled it into the OS. That's why I can find no APC specific files. The only thing at the APC site for my model is for Windoz. On the incredibly small chance that you might find something, try this link to the <
APC Product Support page> and enter your model number.