[Therion] extention at the rear of the Distox

Hi, Evaristo and Martin have showed extentions for the Distox. It is a very good Idea. But what is with the so extended length of the distance? Must I change all measurings by hand in the list of Pockettopo or Topodroid or is there a possibility to "say" that to the distox by default? Thanks for the answers. Regards Markus BTW: The meeting at Ebensee was very good and interesting for me as a "only" user.