B. K.,
Will all my respect, for one I think that your petition can go against Roll20 characteristic "immediateness" and ease of use.
I'm saying this after having experience with other apps featuring detailed "combat trackers".
One of my points here is that once you start adding optional complexity in the Turn Tracker, it's difficult to know where to stop.
For me it has been a breeze to just take NPC snapshots --with its stats-- from PDF books and placing them inside Roll20 as handouts, instead wasting so much time typing all these info again in the fields of a "combat tracker".
For NPCs and/or creatures on paper books, it's possible to do the same with a scanner or by taking photos.
B. K. said,
Patrick, while I'm aware of the token description field, it's not a quickly accessible field. The point of my suggestion is to have custom values available at a glance, vs at least 3 clicks to access the description field.
Alternatively, you can check the thread "Quick and Dirty Contextual Notes Access" (<a href="http://community.roll20.net/discussion/2881/quick-and-dirty-contextual-notes-access/p1" rel="nofollow">http://community.roll20.net/discussion/2881/quick-and-dirty-contextual-notes-access/p1</a>), containing a suggestion that could match with what you are asking here, but not in the Turn Tracker.