I'm guessing that the developer, Metazoa, uses only epubs, not kepubs, so the kepub aesthetics will not have been a consideration e.g. big header margin, small footer margin and leading dash in footer text. Those problems don't exist in standard epubs.
I'd also guess that many of the people enabling the 'decreased footer size' were also already taking steps to set widows/orphans to zero in their epubs. So seeing widows and/or orphans on many pages will be the norm for them.
Having said all that, on my AuraHD I did substitute the v05 setting for 'Decrease footer example' into the v07 kpg.conf file. The v05 setting does seem to give more control over footer height. I never installed v06 so I'm not sure what method was in use there.
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