I've actually seen Saotome Sensei use a bokken as a walking stick. And many jo forms start from a hiking staff grip.
No matter what the purpose, the way a person holds their own body, with or without a weapon, is extremely revealing.
Can be revealing. Depends who it is thats looking. Even then I wouldn't trust many 'experts' views.
How they hold their body can be very deceptive too. Too many stuck on physical posture for my liking.
Yes, many things can be done with the bokken or jo from many positions other than 'standard' suburi and such. To me they are more like kata with a weapon or even joint kata.