Great plugin, great support... like your style, Dude.
I added a little patch that allows the prev/next posts to be restricted to the same parent using a new
'same_parent' => true parameter. This is useful when you want to skip child posts, especially if they are of the red-headed step-child variety.
The modified ambrosite-post-link-plus.php file can be viewed/downloaded from pastbin: http://pastebin.com/eUPtLdPR
Again, great plugin (have marked it top stars)... hopefully you will consider including the same_parent parameter in the next release.