[Android Q&A, Help & Troubleshooting] S0AndS0:
I've written a few guides here and there, if you search hard enough you'll find one about

Folders plug

http://xdaforums.com/showthread.php?t=1502893

that I wrote once about that app... I think so anyways :) if not then here is a quickey to save time for all readers that stumble across this work around

1. Get some warnings out of the way

~ this app is in beta (currently)

~ requires root

~ use at your own risk

~ don't use on system apps (like your phone or contacts)

~ don't use on apps that you rely on (anti theft apps for example)

~ I'm not the dev of the app just a supporter

~ make a backup (nandroid style) then back all that up and what ever you value on you sdcard somewhere else

~ I've done some hard testing with this app and put two devices into boot loops / simi-bricked states. So know how to recover from this and be careful.

~ I have yet to fully brick any device ever, even with this app, so it might be safe when used properly.

2. Provided the warnings don't bother you, then download and install the above app

3. Open the app and be presented with a few options

~ under menu + Preferences = Mount on boot

~~ I would not use this until playing with the other options first and seeing how your device responds

~ under menu + Edit = a screen that will say something like "no mount points selected"

~~ this is where the magic happens, move to step 4

4. Under 'menu + Edit'

4a~ now press menu and then "Insert"

~ this is where things may be confusing

4b~ For source folder you may want to make a new folder on your sdcard with an app like root browser (hint this app comes bundeled with ROM Toolbox; another fantastic app) I put mine under '/sdcard/Adev/Internal_Spoof/' and then make a new folder path per app from there

4c~ For Target folder things get a bit complex; you've got to find the folder on the device's internal folder structure (root browser for the win on this again) that contains the apps data.

... be back to edit the rest in in a sec, just posting to ensure you know I'm still here ;)

5. Before finalizing any links you should probably back up the app data somewhere else too. For example '/sdcard/Adev/Internal_Spoof/backups/'

6. So you've got a good target for both now there are more options.

6a~ you can press accept and then press and hold on the connection you've just made and then select mount

6b~ or after setting a bunch up the main screen with the red plug icon can be pressed like a button to activate all the ones in the list that have a green check box next to it at once.

7. Once you've tested this... for example I used;

~ for Source I used '/sdcard/Adev/Internal_Spoof/download

~ for Target I used '/data/download'

And kinda get what's going on here and know where you app data is saved (hint I think mine is under '/data/data' but yours maybe different) it's time to make it useful for your quest for more space to install apps (among other things too maybe?)

7b~ so if an app like Pandora is under 'data/data/com.pandora' and you map it like so--

~ source '/sdcard/Adev/Internal_Spoof/Pandora'

~ target 'data/data/com.pandora'

-- and back the data from '*/com.pandora' to '*/Internal_Spoof/Pandora' and then activate the link... then nothing will look different... except when you view the available space that its :D

8. Rinse and repeat for each app and don't forget to copy the data (otherwise it'll brake the app till you un-link and copy the data ;) ) and remember not to do it to certain apps.

9. Once you've verified that it's all good and your apps run with ok levels of lag you can try testing the "mount on boot" option that I told you not to use yet. If it works after a reboot then opening and interacting with the affected apps, then rebooting again and interacting again and rebooting again, then it's time to do something dangerous...

10. Provided that your with me so far and things are good on your device its time to do the risky bit; deleting the data from 'data/data/com.pandora' and running it strait from sdcard and re-testing for broken apps with a reboot.

This will effectively open real system memory back up for other tasks but like I said use at your own risk.

final edit before seeing any feedback- this work around may seem a bit complex at first but once you've got a list of apps that work when short-cutted like this it can make a big difference in how much available space can be accessed, however, this may cause force closures on some apps, and may degrade the life of your sdcard. Furthermore in some usage scenarios I had better battery life but that's for another guide on another day :)

I'll be linking in a google doc version of this guide when I get it shairable and maybe link in screen shots or screen casts for better guidance. If I've really helped then consider hitting the thanks button ;) and happy hacking and modding.

Sent from either my SPH-D700 or myTouch3Gs

Debian Kit/QEMU Linux Install guide for all android devices that I'm writing:

http://xdaforums.com/showthread.php?t=2240397

Now have working Installers for ARM Java 7 JDK + Maptools + jMonkey