Well, Joffm gave you already the solution. In the token administration, when creating a new token, you can choose your own token.
His screenshot is in German, but the second input field, where it says "Zugangsschlüssel" you can actually define the token that you want. If you leave it empty and let Limesurvey generate the token, or use your token.
However, keep in mind that firstname + lastname might NOT be unique, which could be problematic. I guess each patient has a patient number that should be unique and the physicians should know that ID, right? Better use that than constructs like firstname / lastname.
His screenshot is in German, but the second input field, where it says "Zugangsschlüssel" you can actually define the token that you want. If you leave it empty and let Limesurvey generate the token, or use your token.
However, keep in mind that firstname + lastname might NOT be unique, which could be problematic. I guess each patient has a patient number that should be unique and the physicians should know that ID, right? Better use that than constructs like firstname / lastname.