We found that we needed pages NOT excluded from nav for BreadCrumbs, but did want them excluded from MegaMenu.

I added a page attribute "exclude_from_meganav". Allowing us to chose not to exclude from nav but still exclude from MegaMenu. It was a one line change in your block controller.
From:
public function excludeFromNavViaAttribute($c)
{
return $c->getAttribute('exclude_nav');
}

To:
public function excludeFromNavViaAttribute($c)
{
return ($c->getAttribute('exclude_from_meganav') || $c->getAttribute('exclude_nav'));
}

Of course you will want to create that page attribute during package install.

HTH,
Sean

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