New Feature : move with limited distance

Hi guys,
first of all, I would like to say well done for the recent new feature "Don't move" (as a checkbox). Now I hope that the next step will be the feature presented in my next words.
New feature : Limit the distance walked during the round (like the time can be limited)
Some people think it's technically impossible to do this but personally I have a good idea how to do this : for each movement register the current position and calculate the distance by difference with the previous one. When the total reach the limit setted then stop all movements.
An alternative feature could be to limit the distance radius around the starting point ;).

Thanks for your amazing work,
modellus