[Sprint Samsung Galaxy S 4 General] rawintellect:
The short answer to every one of your statements is to follow my OP. This process works. It's well established. But in the interest of supporting this I will respond to your questions.

Q1) This should work on any S3 with no problems. The file structure is the same. To verify init.d support:

1. Download the file from here: Attachment 1612958

2. Extract the file, you will get a file named 00test. DO NOT flash!

3. Paste it into /etc/init.d. If there is no init.d folder, most probably you DO NOT have init.d support. However, if you still wanna try, just create the folder named "init.d"

4. Change the permissions of the init.d folder and 00test into rwxrwxrwx.

5. Reboot.

6. If you see a file named Test.log in /data, you have init.d support. If not, you will have to run Uni-init, Term-init or Zip-init.

Q2) To simplify this answer:

Any reference to the files will end up referring to where you moved them

. The mount point is just a pointer. It's not the data. Treat it as the real data. You don't need to concern yourself with whether or not you're backing up the "real data". You are. Just run your backups. I use TiBu too and I simply run my backups. I don't have to worry about whether or not the data is backed up. If i want the app + the data I specify that in TiBu.

Q3) As has been mentioned a few times by me in this thread: The ONLY downside with using foldermount is a longer load time of the game (or app). It's not noticeable in apps and BARELY noticeable in games. Once they load they play and function EXACTLY the same.

Q4) As mentioned above the only downfall is loading time. A faster sdcard = faster loading times. I have no idea what the internal card reading for an international s3 is. I'm sure you can google it.

Q5) You cannot link system apps with link2sd. Foldermount gives you a warning that it may not be possible to link a system folder. You can try but it will either work or it won't.

Q6) link2sd links apks, lib files, and cache. It's not a lot. So even a huge amount of this takes up very little space on the second partition. Yes foldermount creates a regular folder on the extsdcard. you can browse it with your computer plugged into your phone. as for ext2,3,and 4 the kernel I use has some incompatibility issues with ext fat. so I'm currently running fat 32 for my 2nd partition for link2sd. it's fine. you can run it as well. most roms support fat 32.

Q7) There is no automated procedure for mounting folders. That has to be done selectively by you. As for link2sd? You can select your apps to be automatically linked during installation. As for the data? link2sd does not move data. As I said before it moves the apk, the lib files, and the cache. You can manually undo this for ANY linked app by opening link2sd ,selecting the linked app and pressing remove link. It's as simple as that.

Finally don't want to come off as being mean. I do thank you for all the compliments and hitting that thanks button. It really does mean a lot to me and any other developer out there to know that our time is appreciated. It's just that if I took the time to type this kind of response to each and every person in this thread I'd NEVER leave xda. Please understand that.

Just have faith in the process. It works. It's been established and used by literally thousands before you.

Thanks again.