There is not a specific flag as such. At least not one that I am aware of, through the GUI.
If a "Component" falls out of scope, the install will attempt to repair itself.
I hate to point people at the help file, but on this one I think it is quite usefull.
I would take a few minutes to review the "Organizing Applications into Components". By adhering to this, or more to the point. Having a good reason not to, InstalShield takes care of this process for you.
You can find some documentation under "Auto-repair" in the help file. But without a solid understanding of components, it is little more than interesting reading. 🙂