I can't completely agree with you. I use only PostgreSQL, but I used to help my colleague working with Oracle (he was a novice), and I looked at his result of EXPLAIN (it was different from what PostgreSQL gives, but quite clear). I am not sure that in every database engine PRIMARY KEY constraint is implemented using index. So you give some astonishment to people not familiar with PostgreSQL but familiar with some other DBMS and able to understand result of EXPLAIN.
In phpPgAdmin, we list them separately as well, however it did require some thinking. In the end I decided to display things in the way the SQL spec lays them out. All constraints together, etc.
Chris
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