1. Not a problem. OC is legal, CC is legal. If you are in (or on) your vehicle, you can have it your way. Whatever your way is. Open is fine Concealed is fine. Middle ground is fine.
2. Riding is just the same as being in a cage a far as the law is concerned. I ride everyday and put about 10k miles on my bike/ year. I carry everyday on the bike too. As far as resting an elbow or reaching in a pocket... basically as long as you don't treat it as an issue neither will anyone else. It is only when you look all shifty eyed and wierd that anyone even notices.
3. Again you seem to have a pretty good handle on things here. Going through is just fine. If you stop, lock it up.
More specfic answers to questions you have not yet asked can be found here, including statute referances.