Hi Denverdude,
What you could do is to make a button in ACAD that open cadtools for you when you click it. But that would be the same as adding it to your windows toolbar.
Firstly you need to make the following lisp file.
(defun c:CAT ()
(startapp "C:\\Program Files\\Cadtools\\CadTools.exe")
(princ)
)
save this as CAT__Start CADtools.lsp
Also you must make sure that the lisp file is in one of you ACAD support folders.
If you do want to make a custom button.
Go to Tool, Customize, Interface.
Then create a new button.
^C^C(load "CAT__Start CADtools") CAT
use the above macro to enter in the command section.
Save button and add to your ribbon or a toolbar and PRESTO.
Is somewhat of a complex setup but it will work.