Hi @DMS and thanks for sharing your feedback 
That is not possible at the moment I’m afraid, you could possibly look into using Rules to move these tasks to another project you would entirely dedicate to “Archived/Deleted tasks” but that’s only a workaround and wouldn’t actually delete these tasks.
You might also be interested in upvoting this other thread Removal Action When Using Rules which is in some way similar to your request and on my end, I’ll make sure to keep you posted as soon as I have an update!