BST - Im not Entirely sure they know what your asking maybe...
I have a GT2 and a few other devices that can do what you are trying to do.
I think what BST is trying to say is..
If I download an game off the app store it automatically saves the main app to my internal storage, in this case being 8gb. If the file size is 200mb that is fine, doesnt take up alot of space. But once i use that app, it starts a dl for the rest of the data for the game which could be another 200mb-500mb(Just estimating a Higher end game vs little popcap games)...and it saves that additional data to the internal storage labeled in the GT2 as SDCARD.
I know moosc seems to think that that 8gb of storage should be enough since he has a few hundred apps...but, 8gb with only 4-5 usable out of box doesnt offer much space when a single game file after dl can reach upwards of a gig.
Alot of apps,(most ive downloaded, games usually) save the initial app to the internal storage, but save the additional file dl data to an external "SDCARD" if applicable. Since the GT2's Internal storage is labeled as "sdcard" the apps BST is trying to run are programed to save that added data(any data aquired after main appstore dl) to an sdcard rather then internal storage so that it keeps the devices internal storage open and available, are being saved to her Internal storage.
GT2 storage: Actual Internal storage = SDCARD
sdcard = extsdcard
Pretty much. since the GT2 has its internal stock 8gb labeled as sdcard, and an inserted sdcard labeled as extsdcard...apps that save any data after the inital dl off the store end up saving that data to the devices internal storage, rather then the sdcard shes inserted.
What BST is trying to do, Is find a way to get that data saved to the 32gb sd card he's inserted like its supposed to, rather then saving it on the 8gb internal storage, which its not supposed to.
Nobody here wants to move the Main app to a External card. Just the data that app downloads or creates like its supposed to do.
The other Devices i use with the same apps have np saving their data to the sdcard since the internal storage is labeled accordingly.
So far the only answer anyone has really provided to the original questionis essentially, buy a device with more internal storage....which doesnt help.