Newbie question about the Link dialogue

I'm upgrading from FCKeditor and need a little help, we have a very simple cut down RTE which only allows users to add very simple links (e.g. only external links with http or https protocols).

I looked at the CKEditor docs and created a simple Link editor (based on the tutorial, SimpleLink - BTW, the CKEditor plug-in system is very impressive! : ). Created a simple plug-in which does what we need, so all is well. Except, the existing Link dialogue is still the default link editor, I've removed it form the toolbar but it's still crops up, if you double click on a link, in the context menu etc...

So the question is, should I a; find everywhere the built in Link editor is triggered and disable it, or b; abandon my SimpleLink plug-in and find the source for the existing Link editor and amend it?

Any suggestions very welcome, thanks in advance...