Now we are getting somewhere....
I would love to have this conversation over a beer with a bunch of fellow, knowedgable shooters. We could go on for hours. I'd be hammer drunk before we figured them all out. Frankly, you have to establish an endstate or direction before you can name your key tasks, or enabling learning objectives, or your path to the goal. And that is the MF'r of it. If you are to get a bunch of PRS Shooters together and asked them the endstate it would be different for all and similar for some. Here are a few of the anticipated answers.
1. Get away from the wife to do guy things with the guys. Immaterial what that is exactly
2. Beat other people in competition and feel good about myself. Immaterial what that is exactly
3. Have fun at a hobby that I enjoy. Immaterial what that is exactly
4. I like shooting long guns in a way I can't explain and whatever long gun challenge an MD sets before me is fine; I just want to be challenged and meet them. (That is 90% me)
5. Want to be a sponsered badass and I throw shit when I lose
But not to cop-out, I'll answer some of your questions.
1. I actually think the PRS barricade is a pretty good one for excatly the reason RyanM quotes... except I'd like to see asymmetric sides so your not repeating the same positions. Probably a short, crouched window, and an awkward low not-prone and not-kneeling
2. Mover. I know movers are expensive and break often but you have to admit shooting a moving Target at distance the ultimate skill...for skills sake.(I won't even go down the realistic road)
3. Breaking positions. On apparatus that require a couple of steps from each othe. On an accumulated stress test (or IPSC/ 3G stage) the shooters ability to move into shooting positions and out of shooting positions fluidly without a bunch or fidgeting and mis-stepping is the difference between a pro and an amateur.
3a. A variation. I ran this stage at a club match I directed. Learned this from the AMU guys as an isolation drill to gain speed in the gas gun match. Stepping back one step from the PRS barricade, on a pro-timer, drop into one shooting POS and fire one Rd at the tgt. (12" at 300yds) <4 secs = 3pts, <6secs = 2pts, <10secs = 1 pt. Reset and repeat 4 for a total of 5 runs using a different spot on the bde, Shooters choice, may not repeat pos twice. This isolates your ability to step right into a NPOA on tgt. The key is to keep your eye on the tgt, watching gun-tgt line in your peripheral and using that to guide the guns barrel within a few mils of the tgt, lastly dropping your cheek onto the comb and efficiently transferring your eye to the scope. If you're successful the tgt will be within a few mils and you can move and shoot (trigger control, wbble zone) if you've gaffed NPOA and and your body isn't behind the gun or you've gaffed gun-tgt line and your outside 8-10 mils or worse the FOV and you have to drastically shift your body over to achieve a sight picture, you've gaffed NPOA and your wobble some is going to be huge. This is an advanced extension of a dot drill.
A couple more ideas based on relevant skills.
1. Maintaining a consistent zero thru solid position fundamentals is key to having good data, a day 1 task and critical to beginners. The 10rd dot drill is an exercise (a drill) that works that basic skill and builds muscle memory and eliminates cognitive action. The shooter needs to be doing other things in this moment than congniively focusing on "... head position...okay, sight alignment,.....ugh,...support hand...NPOA..interrupted trigger squeeze, now natrual respiratory pause, double check sight picture and algnment, ...ughh,now squeeze...ughh"
2. True'ing data at distance. Core skill. How are you going to shoot a precision rifle match with shitty data or inconsistent loads. 4 tgt out to 1200, 2moa tall and 3mph wide...
Just a couple of ideas of the top of my head before my typing thumb explodes.
Where does a mag change rack n' stack in a 10rd match against the above skills?