welp, like I mentioned earlier, The REASONS why I could see you needing camber plates is for race purposes only.
Camber plates usually have settings you could adjust it to so that you don't have to always put your car on an alignment machine to figure out where your camber is at. If you set it to -2 on the plate, it should read the same on the alignment machine. THUS you can always set your car back to "stock" settings once your finished at the track and you now need to drive it home.
KSport and D2 probably make them because it's an opportunity to make money or they're meant to be used more on the track. TEIN and JIC don't have them because the manufacturers know it's unnecssary with they're set up because they're aimed more towards the street and not the track so therefore they're probably expecting that you would go get an alignment. (Hence the name: TEIN SUPER STREET) But if they were to make it available to use with they're set up, and there's people like you who have no idea that it isn't required, they'll just suck more money out of you for something you didn't need.
Here's some advice. Figure out what exactly you want to do with your car. FULL RACE - JIC FLT-A2. -OR- KSport/D2 (just because they have camber plates

)
DAILY DRIVEN/WEEKEND WARRIOR - Tein SS's or the JIC FLT-A1
DAILY DRIVEN/OCCASIONAL TWISTIES - Tein Basics
SLAMMED TO THE GROUND - Skunk2's
As far as height adjustablity, you have me stumped. Each coilover has it's own spring seat and locking perch. What else would you need other than the spring seat and locking perch? you said that there is only 2 and not 3. What would the other one be for? Usually manufacturers of coilovers or even aftermarket shocks, design they're products to be used with lowering springs or coilovers. So the shock travel is usually shorter but a lot stiffer. And that's why stock shocks usually crap out within 7k miles. With Tein Coilovers, the shock itself is threaded for the locking perch and spring seat. So I don't know what you mean by "the shock body cannot be moved inside of the lower bracket cylinder".