There is an app over at xda-developers that is similar to the PPC6700 app that allows the user to do standard tweaks. Included in the app is the ability to install cabs as a group. The tweaker app is a little buggy, but it will do the cab stuff fine.
http://forum.xda-developers.com/show...hlight=tweaker
If you are building your own roms, there are other options, but it gets more complicated.
You can also use the config.txt from the ExtRom and add your files from you SD.