Did you change the title of this thread?
Anyway... you have at least 2 choices.
1. swap out the playable character with an npc version.
2. you can use Lua script to temporarily tell the engine that left click shouldn't update the destination.
game.LeftClickBehaviour = eMouseActionBehaviourDoNotSendCharacter
Here are all the available options you can use:
- eMouseActionBehaviourDoNotSendCharacter 0
- eMouseActionBehaviourSendCharacterToCursor 1
- eMouseActionBehaviourSendCharacterToObjects 2
The default option is:
eMouseActionBehaviourSendCharacterToCursor