Proposed new functionality:
Select a specific throw or catch location, and let NetBeans list all possible corresponding catch or throw locations, respectively.
Let NetBeans list all throw or catch locations that are never caught or never triggered, respectively.
Let NetBeans list all catch locations that are not by reference-to-const (for struct/class types), or that are for non-struct/class types, etc.

Motivation:
Can I remove this handler? What happens if I fix the type (don't ask...)?

Non-goal (workaround: use the above and one's own brain):
Let NetBeans list all catch-by-value locations, differentiated by whether the originally thrown object might be sliced, and then by whether something would change if the type is changed to reference-to-const.