Selective Keep Interim on with Workflows

Description - To investigate the data targeting data generated in workflow execution, keeping interim results is the best option. It is not recommended not to use it in live workflows, but at times this is needed in big campaigns. It would be nice to have a feature where a user can select only some particular workflow activity/activities where temp data can be held for later analysis. 

Why is this feature important to you - We face this situation daily and have to use the keep interim on for the workflow which generates many temp tables and consumes db space.

How would you like the feature to work - To have an interim option on the activity level and selectively have workflow temp tables to for analysis using display target.

Current Behaviour - Keep interim works for the entire workflow.