In reply to 1), pages 93 and 94 of the d8b V5 manual give a pretty good explanation of the principles. It is important to totally plan, on paper, everything you want to achieve. It can get messy if you just go at it in an ad hoc manner.
Avoid midi channel 1.
Start with midi channel 2.
Leave continuous controller, polyphonic aftertouch and note value "0" 'till last (if you need them at all). Start with continuous controller 1 for channel 1 fader and work your way up. Same with note on 1 for channel 1 mute (which needs to be set to toggle, btw * ), aftertouch 1 for pan, etc. What I'm trying to say here is that in this way, the midi values equate to the channels in an orderly fashion. This will of course mean that if you steer clear of Bank 4 (Masters), you will only be using 72 values of the available 128 midi values for each midi parameter with the possible exception of continuous controllers on midi channel 2 (your first pass) where you may want to map the Master L/R fader to controller 73. I however prefer to use a separate midi channel altogether for functions that are mapped on the right hand side of the desk.
Change midi channel to 3 then 4 and so on for other switches and variable parameters like auxes etc. always starting at midi value 1 as mentioned above.
Do the mapping in sequence. ie., map all faders first. Then map all mutes, then pans etc. You can choose your parameter order preference but this is so that when you look at your midimap, each function on the desk will be visually contiguous.
As for question 2), you got me
Peter
* It needs to be set this way in Logic as well.
In the scheme of things, there isn't one... just chaos.