I just had an idea, if it would be possible to add a sound effect, or even crash the heli when he is leaving the landing circle or the 'Leitkegel'. This could be used to train to stay in one spot. Would be nice if this could be added.
there is already a similar function. Open the menu, switch to the 'Training' tab and set the 'Limited Area' in the 'Hover Trainer' section to the desired radius. Activate the hover trainer (key t).