I bought mine with the same purpose in mind. I went TnT 2.11 as well.
As far as getting the ROM installed, the extra microsd is a fail-safe. To accomplish an update, all you need to do is copy the proper files to the internal storage of the gTab (will show up as external drive to your pc when you hook it up via usb, and enable on the gTab). Then, you force a recovery boot (when off, push power, while holding VOL +, wait for message indicating recovery mode). It's actually very simple.
With the latest Flash Install, and Market Fix, I am a mouse cursor away from leaving my Netbook at home, permanently. (Hope we can get Mouse working in TnT like the other ROMS. Pretty sure I'm sticking with TnT at this point)
You may not want to get too deep with 2.11, however, roe has 2.2 coming out in a couple of days, which will include some fixes.