It would be extremely useful to be able to see information about the constant pool, and how it is referenced. The simplest being just a table of all the constants (this could be a very large table), and how many references there is to that constant. Another variant could do this with a column per event type, etc.
We probably want to be able to tell the parser whether it should be calculate this information or not, as it may end up having a noticeable performance and memory impact. (Default on for the JMC UI, naturally.)