You can use JS, though, to create a pop-up menu that will open when a link is clicked.
Thanks for your answer.
What we are trying to achieve is not to reproduce in Acrobat the behavior of our own reader. What we need is a way to make it easy to enter links in Acrobat with our specific syntax.
I understand it's not possible to create an interface hooked up to the link tool. Now, if the user selects a link previously created with the link tool, and then starts our script using a custom menu (or whatever), is it possible inside the script to detect the selected link? And is it possible to change the destination of this link?
The answer to both questions is no. It might be possible to do it using a plugin, though. You can ask over at the Acrobat SDK forum about that.