Especially shrub, with his million and one optional features 
A command which summerizes the current mod settings. So you can bind (for example) modconfig to a key and have it tell you which gameplay features have been changed.
Why not just have them published in server info (sets) ? Because that has limited space.
I know you can use /pb_cvarval cvarname but the problems with that are
- pb and cvar querying must be enabled.
- you have to remember the cvar names, and tab completion wont work.
- you would have to type a bunch to see all the settings.