It’s not documented whether this parameter does anything here: https://graph.api.smartthings.com/ide/doc/smartApp.
In one of my apps which I hodgepodged together from another app I use runIn(delay, lockTheLocks, [overwrite: false]). I can guess that in this example the runIn() timer would continue counting even if you ran runIn() again but this is speculation since it’s not documented.
Anyone know exactly if and what that parameter would do?