For those interested, I've created a work-around. The idea is to fill up the memory on the device with *your own files* so the auto-pushed download will see that there's not enough room on the device and won't begin the download at all. The approx max size you need to leave *free* on the device is ~2.45 GB. The download will not initiate if this size (or less) is on the device. If more memory than this is free, the download will begin again when the device is connected to Wi-Fi and is externally powered.
1. Create a video file on the iPad's video camera of about 5 minutes in length (~684 MB) which you use as "padding", taking up space on the iPad.
2. Copy that file multiple times into a folder on your HDD, renaming each one sequentially IMG_01.MOV (IMG_01 - IMG_20. I have 20 copies on mine.
3. Restore the iPad as new from the iPad itself (Settings>General>Reset>Erase All Content and Settings) to keep the device at iOS 6.x
4. Setup the iPad with Wi-Fi and activate it.
5. Disable Wi-Fi on the iPad.
6. Take one picture with the iPad (to create the Camera folder on the iPad)
7. Download & install iFunBox (Google it)
8. Run iFunBox with iPad connected and access the Camera folder on the iPad
9. Fill the Camera folder with the video padding files you created above. On my 16GB mini, I filled the folder with 17 of the video padding files, leaving ~2.45 GB free on the mini.
10. Re-enable Wi-Fi on the device.
11. Copy your apps/music/etc to the iPad as you would normally. As your memory size reduces on the device, simply delete one or two of the video padding files using iFunBox being careful not to leave *more than* ~2.45GB free. This way, *you* have control over what is being pushed (or NOT pushed) to the device and when you need more memory, you free it up yourself as needed.