Picandnix, yes, I needed to gain the controls that are in the 'Extras' menu as well, but I managed to solve that, DivaVocal's link was very helpful - thanks Diva! - so, if this can help gxjenkins or anyone else, here's how I added the 3 items to the 'Extras' section in the admin panel:

admin-> admin access management-> admin page registration (tool available only for zc 1.5.x, as I read somewhere)... a page with a form to compile will appear. I compiled the form as follows:

for Links:
Page Key= links
Page Name= BOX_LINKS
Page Filename= FILENAME_LINKS
Page Parameters= leave blank
Menu= select 'Extras' from the dropdown
Display on Menu?= check the display box
Sort Order= 6 (or whatever order number you would like to assign to this item)
... then press 'insert'

for Link Categories:
Page Key= linkcategories
Page Name= BOX_LINK_CATEGORIES
Page Filename= FILENAME_LINK_CATEGORIES
Page Parameters= leave blank
Menu= select 'Extras' from the dropdown
Display on Menu?= check the display box
Sort Order= 7 (or whatever order number you would like to assign to this item)
... then press 'insert'

for Links Contact:
Page Key= linkscontact
Page Name= BOX_LINKS_CONTACT
Page Filename= FILENAME_LINKS_CONTACT
Page Parameters= leave blank
Menu= select 'Extras' from the dropdown
Display on Menu?= check the display box
Sort Order= 8 (or whatever order number you would like to assign to this item)
... then press 'insert'

Now I have all 3 links in the 'Extras' section of the admin. However, still could not solve for the Links Manager link under the 'Configuration' section, the only admin Links Manager files I found in the mod's folder are these:

admin/includes/extra_datafiles/links_manager.php
admin/includes/functions/extra_functions/links_manager.php

... and there are no defines in there for Page Name and Page Filename... could these be created in some way or added perhaps to the existing files?