The only way to achieve this, so that it would work for others when it is emailed, is possibly by creating a macro to perform this and embedding the macro in the document so that it runs on the persons computer but depending on who you are emailing this to you may find they will not allow a macro of this type to run on their computer because it is altering their computers settings.

Personally this setting is there as a security feature so trying to alter other people's computers to achieve this is a bit invasive and I would probably not recommend it. Users of the document should be able to decide if they want the Ctrl + click feature on or you can always put a note in the email of how to turn off this function should they choose to do so.