Apple Logic Pro /LogicExpress Discussion

I am fairly new to Logic - my background is on hardware like an MPC.

1) LOOPING INDIVIDUAL TRACKS
If I create and layer a couple of MIDI tracks - I found out to to drag  
each of them out but instead of extending the Track, the track loops.  
Perfect. If the track I want to loop is selected, then hovering over  
the right hand side says Loop OFF and it essentially draws the track  
out but no loop. If the track is NOT selected, then hovering over the  
right edge of the track shows a loop icon and dragging it out loops  
it. Is there a more technical way to do this? IE: if a track is  
selected and you drag it out, you add length but if it is not  
selected, dragging extends as a loop?

2) REPEATING A TRACK
So now, I have an 8 bar track that I loop 2 times. Perfect. After n  
bars of silence now, I need to start the loop again. I guess I can  
copy the root 8 bars and then extend them as a loop from the new  
location - but is there a way to do this in Logic that would be more  
like a reference to the original 8 bars? If I improve the original 8  
bars, I don't want to have to go around to every copy of the 8 bars  
and 'improve' 'them also? What would you call that? A reference?

3) REPEATING A SECTION
For clarity, I am referring to a group of tracks as a SECTION. Lets  
say I've got the Chorus completed ... 24 tracks of pure goodness.  
Well, that chorus is going to come back around 4 times. How, in Logic,  
can I 'repeat' that section such that, a change to the original  
section would be represented in all the new, linked or referenced  
setions? To further complicate, what if I'd like to add a unique lead  
line to chorus iteration 4 ... does the SECTION expand out in the  
tracks window such that I could easily add another track and not mess  
up the SECTION?

I did notice something called Apple Loops. Does that work for MIDI as  
well as Audio? Would that feature apply to any of my questions here?  
Would I create a SECTION as described and then save it off as an Apple  
Loop - and then can I drop that anywhere in the song? I was  
disappointed in that it appears you create a loop and then it gets  
stored in a central repository ... well that's not good. I need that  
loop stored or archived with the song. I don't want to use it in other  
programs on the Mac - I want to use it in my song.

Hope these questions make sense. If they don't have direct  
implementations in Logic, are their ways to create the same end results?

Thanks in advance for any input.

-Luther